diff --git a/.idea/encodings.xml b/.idea/encodings.xml
index aa00ffa..4dde29f 100644
--- a/.idea/encodings.xml
+++ b/.idea/encodings.xml
@@ -1,6 +1,10 @@
 <?xml version="1.0" encoding="UTF-8"?>
 <project version="4">
   <component name="Encoding">
+    <file url="file://$PROJECT_DIR$/data-structures/src/main/java" charset="UTF-8" />
+    <file url="file://$PROJECT_DIR$/data-structures/src/main/resources" charset="UTF-8" />
+    <file url="file://$PROJECT_DIR$/low-level-design/src/main/java" charset="UTF-8" />
+    <file url="file://$PROJECT_DIR$/low-level-design/src/main/resources" charset="UTF-8" />
     <file url="file://$PROJECT_DIR$/src/main/java" charset="UTF-8" />
     <file url="file://$PROJECT_DIR$/src/main/resources" charset="UTF-8" />
   </component>
diff --git a/.idea/workspace.xml b/.idea/workspace.xml
index dac362a..d0d412f 100644
--- a/.idea/workspace.xml
+++ b/.idea/workspace.xml
@@ -4,9 +4,16 @@
     <option name="autoReloadType" value="SELECTIVE" />
   </component>
   <component name="ChangeListManager">
-    <list default="true" id="d1dce324-e0e9-40ed-8855-0f1c77b6fb86" name="Changes" comment="PRIMS MST added">
-      <change afterPath="$PROJECT_DIR$/src/main/java/com/thealgorithm/stacks/LargestSubMatrixWithRearrangements.java" afterDir="false" />
+    <list default="true" id="d1dce324-e0e9-40ed-8855-0f1c77b6fb86" name="Changes" comment="multimodule">
+      <change afterPath="$PROJECT_DIR$/low-level-design/pom.xml" afterDir="false" />
+      <change afterPath="$PROJECT_DIR$/low-level-design/src/main/java/com/thealgorithm/caching/CachingLocalTest.java" afterDir="false" />
+      <change afterPath="$PROJECT_DIR$/low-level-design/src/main/java/com/thealgorithm/caching/DataExpiredException.java" afterDir="false" />
+      <change afterPath="$PROJECT_DIR$/low-level-design/src/main/java/com/thealgorithm/caching/DataNotPresentException.java" afterDir="false" />
+      <change afterPath="$PROJECT_DIR$/low-level-design/src/main/java/com/thealgorithm/caching/InMemoryKeyValStore.java" afterDir="false" />
+      <change beforePath="$PROJECT_DIR$/.idea/encodings.xml" beforeDir="false" afterPath="$PROJECT_DIR$/.idea/encodings.xml" afterDir="false" />
       <change beforePath="$PROJECT_DIR$/.idea/workspace.xml" beforeDir="false" afterPath="$PROJECT_DIR$/.idea/workspace.xml" afterDir="false" />
+      <change beforePath="$PROJECT_DIR$/data-structures/pom.xml" beforeDir="false" afterPath="$PROJECT_DIR$/data-structures/pom.xml" afterDir="false" />
+      <change beforePath="$PROJECT_DIR$/pom.xml" beforeDir="false" afterPath="$PROJECT_DIR$/pom.xml" afterDir="false" />
     </list>
     <option name="SHOW_DIALOG" value="false" />
     <option name="HIGHLIGHT_CONFLICTS" value="true" />
@@ -80,23 +87,29 @@
     "RunOnceActivity.ShowReadmeOnStart": "true",
     "SHARE_PROJECT_CONFIGURATION_FILES": "true",
     "git-widget-placeholder": "back__tracking",
-    "onboarding.tips.debug.path": "/Users/subhamsantra/Projects/Interview/TheAlgorithm/src/main/java/com/subham/ta/Main.java",
+    "jdk.selected.JAVA_MODULE": "openjdk-21 (3)",
+    "onboarding.tips.debug.path": "/Users/subhamsantra/Projects/Interview/TheAlgorithm/low-level-design/src/main/java/com/subham/tbpp/Main.java",
     "settings.editor.selected.configurable": "editor.preferences.completion"
   }
 }]]></component>
   <component name="RecentsManager">
     <key name="CreateClassDialog.RecentsKey">
+      <recent name="com.thealgorithm.caching" />
       <recent name="com.thealgorithm.lld" />
       <recent name="com.subham.ta.graph" />
     </key>
+    <key name="MoveFile.RECENT_KEYS">
+      <recent name="$PROJECT_DIR$/data-structures" />
+      <recent name="$PROJECT_DIR$/data-structures/src/main/java" />
+    </key>
   </component>
-  <component name="RunManager" selected="Application.LargestSubMatrixWithRearrangements">
-    <configuration name="LargestSubMatrixWithRearrangements" type="Application" factoryName="Application" temporary="true" nameIsGenerated="true">
-      <option name="MAIN_CLASS_NAME" value="com.thealgorithm.stacks.LargestSubMatrixWithRearrangements" />
-      <module name="TheAlgorithm" />
+  <component name="RunManager" selected="Application.CachingLocalTest">
+    <configuration name="CachingLocalTest" type="Application" factoryName="Application" temporary="true" nameIsGenerated="true">
+      <option name="MAIN_CLASS_NAME" value="com.thealgorithm.caching.CachingLocalTest" />
+      <module name="low-level-design" />
       <extension name="coverage">
         <pattern>
-          <option name="PATTERN" value="com.thealgorithm.stacks.*" />
+          <option name="PATTERN" value="com.thealgorithm.caching.*" />
           <option name="ENABLED" value="true" />
         </pattern>
       </extension>
@@ -104,12 +117,12 @@
         <option name="Make" enabled="true" />
       </method>
     </configuration>
-    <configuration name="MostStonesRemovedSameRowCol" type="Application" factoryName="Application" temporary="true" nameIsGenerated="true">
-      <option name="MAIN_CLASS_NAME" value="com.thealgorithm.graph.MostStonesRemovedSameRowCol" />
+    <configuration name="GenerateParenthesis" type="Application" factoryName="Application" temporary="true" nameIsGenerated="true">
+      <option name="MAIN_CLASS_NAME" value="com.thealgorithm.miscelleneous.GenerateParenthesis" />
       <module name="TheAlgorithm" />
       <extension name="coverage">
         <pattern>
-          <option name="PATTERN" value="com.thealgorithm.graph.*" />
+          <option name="PATTERN" value="com.thealgorithm.miscelleneous.*" />
           <option name="ENABLED" value="true" />
         </pattern>
       </extension>
@@ -117,12 +130,12 @@
         <option name="Make" enabled="true" />
       </method>
     </configuration>
-    <configuration name="PalindromePartitioning" type="Application" factoryName="Application" temporary="true" nameIsGenerated="true">
-      <option name="MAIN_CLASS_NAME" value="com.thealgorithm.backtracking.PalindromePartitioning" />
+    <configuration name="LargestSubMatrixWithRearrangements" type="Application" factoryName="Application" temporary="true" nameIsGenerated="true">
+      <option name="MAIN_CLASS_NAME" value="com.thealgorithm.stacks.LargestSubMatrixWithRearrangements" />
       <module name="TheAlgorithm" />
       <extension name="coverage">
         <pattern>
-          <option name="PATTERN" value="com.thealgorithm.backtracking.*" />
+          <option name="PATTERN" value="com.thealgorithm.stacks.*" />
           <option name="ENABLED" value="true" />
         </pattern>
       </extension>
@@ -130,12 +143,12 @@
         <option name="Make" enabled="true" />
       </method>
     </configuration>
-    <configuration name="PrimsMinimumSpanningTree" type="Application" factoryName="Application" temporary="true" nameIsGenerated="true">
-      <option name="MAIN_CLASS_NAME" value="com.thealgorithm.graph.PrimsMinimumSpanningTree" />
-      <module name="TheAlgorithm" />
+    <configuration name="LeetCode1024Hard" type="Application" factoryName="Application" temporary="true" nameIsGenerated="true">
+      <option name="MAIN_CLASS_NAME" value="com.thealgorithm.array.LeetCode1024Hard" />
+      <module name="data-structures" />
       <extension name="coverage">
         <pattern>
-          <option name="PATTERN" value="com.thealgorithm.graph.*" />
+          <option name="PATTERN" value="com.thealgorithm.array.*" />
           <option name="ENABLED" value="true" />
         </pattern>
       </extension>
@@ -143,8 +156,8 @@
         <option name="Make" enabled="true" />
       </method>
     </configuration>
-    <configuration name="ShortestCycleInGraph" type="Application" factoryName="Application" temporary="true" nameIsGenerated="true">
-      <option name="MAIN_CLASS_NAME" value="com.thealgorithm.graph.ShortestCycleInGraph" />
+    <configuration name="PrimsMinimumSpanningTree" type="Application" factoryName="Application" temporary="true" nameIsGenerated="true">
+      <option name="MAIN_CLASS_NAME" value="com.thealgorithm.graph.PrimsMinimumSpanningTree" />
       <module name="TheAlgorithm" />
       <extension name="coverage">
         <pattern>
@@ -158,11 +171,11 @@
     </configuration>
     <recent_temporary>
       <list>
+        <item itemvalue="Application.CachingLocalTest" />
+        <item itemvalue="Application.LeetCode1024Hard" />
+        <item itemvalue="Application.GenerateParenthesis" />
         <item itemvalue="Application.LargestSubMatrixWithRearrangements" />
         <item itemvalue="Application.PrimsMinimumSpanningTree" />
-        <item itemvalue="Application.ShortestCycleInGraph" />
-        <item itemvalue="Application.MostStonesRemovedSameRowCol" />
-        <item itemvalue="Application.PalindromePartitioning" />
       </list>
     </recent_temporary>
   </component>
@@ -423,7 +436,23 @@
       <option name="project" value="LOCAL" />
       <updated>1725088358813</updated>
     </task>
-    <option name="localTasksCounter" value="32" />
+    <task id="LOCAL-00032" summary="MAANG - top">
+      <option name="closed" value="true" />
+      <created>1725129705304</created>
+      <option name="number" value="00032" />
+      <option name="presentableId" value="LOCAL-00032" />
+      <option name="project" value="LOCAL" />
+      <updated>1725129705304</updated>
+    </task>
+    <task id="LOCAL-00033" summary="multimodule">
+      <option name="closed" value="true" />
+      <created>1725215225004</created>
+      <option name="number" value="00033" />
+      <option name="presentableId" value="LOCAL-00033" />
+      <option name="project" value="LOCAL" />
+      <updated>1725215225004</updated>
+    </task>
+    <option name="localTasksCounter" value="34" />
     <servers />
   </component>
   <component name="Vcs.Log.Tabs.Properties">
@@ -457,13 +486,15 @@
     <MESSAGE value="LC GRAPH HARD ShortestCycleInGraph" />
     <MESSAGE value="LLD" />
     <MESSAGE value="PRIMS MST added" />
-    <option name="LAST_COMMIT_MESSAGE" value="PRIMS MST added" />
+    <MESSAGE value="MAANG - top" />
+    <MESSAGE value="multimodule" />
+    <option name="LAST_COMMIT_MESSAGE" value="multimodule" />
   </component>
   <component name="XDebuggerManager">
     <breakpoint-manager>
       <breakpoints>
         <line-breakpoint enabled="true" type="java-line">
-          <url>file://$PROJECT_DIR$/src/main/java/com/thealgorithm/commons/DesignAFoodRatingSystems.java</url>
+          <url>file://$PROJECT_DIR$/data-structures/src/main/java/com/thealgorithm/commons/DesignAFoodRatingSystems.java</url>
           <line>40</line>
           <option name="timeStamp" value="1" />
         </line-breakpoint>
@@ -473,22 +504,22 @@
           <option name="timeStamp" value="5" />
         </line-breakpoint>
         <line-breakpoint enabled="true" type="java-line">
-          <url>file://$PROJECT_DIR$/src/main/java/com/thealgorithm/strings/LeetCode1624.java</url>
+          <url>file://$PROJECT_DIR$/data-structures/src/main/java/com/thealgorithm/strings/LeetCode1624.java</url>
           <line>22</line>
           <option name="timeStamp" value="6" />
         </line-breakpoint>
         <line-breakpoint enabled="true" type="java-line">
-          <url>file://$PROJECT_DIR$/src/main/java/com/thealgorithm/commons/QuickSelect.java</url>
+          <url>file://$PROJECT_DIR$/data-structures/src/main/java/com/thealgorithm/commons/QuickSelect.java</url>
           <line>27</line>
           <option name="timeStamp" value="8" />
         </line-breakpoint>
         <line-breakpoint enabled="true" type="java-line">
-          <url>file://$PROJECT_DIR$/src/main/java/com/thealgorithm/array/LeetCode2392.java</url>
+          <url>file://$PROJECT_DIR$/data-structures/src/main/java/com/thealgorithm/array/LeetCode2392.java</url>
           <line>61</line>
           <option name="timeStamp" value="11" />
         </line-breakpoint>
         <line-breakpoint enabled="true" type="java-line">
-          <url>file://$PROJECT_DIR$/src/main/java/com/thealgorithm/array/LeetCode2392.java</url>
+          <url>file://$PROJECT_DIR$/data-structures/src/main/java/com/thealgorithm/array/LeetCode2392.java</url>
           <line>71</line>
           <properties>
             <option name="lambda-ordinal" value="-1" />
@@ -496,57 +527,67 @@
           <option name="timeStamp" value="12" />
         </line-breakpoint>
         <line-breakpoint enabled="true" type="java-line">
-          <url>file://$PROJECT_DIR$/src/main/java/com/thealgorithm/array/LeetCode2392.java</url>
+          <url>file://$PROJECT_DIR$/data-structures/src/main/java/com/thealgorithm/array/LeetCode2392.java</url>
           <line>55</line>
           <option name="timeStamp" value="13" />
         </line-breakpoint>
         <line-breakpoint enabled="true" type="java-line">
-          <url>file://$PROJECT_DIR$/src/main/java/com/thealgorithm/array/LeetCode1024Hard.java</url>
+          <url>file://$PROJECT_DIR$/data-structures/src/main/java/com/thealgorithm/array/LeetCode1024Hard.java</url>
           <line>38</line>
           <option name="timeStamp" value="16" />
         </line-breakpoint>
         <line-breakpoint enabled="true" type="java-line">
-          <url>file://$PROJECT_DIR$/src/main/java/com/thealgorithm/array/IntQuickSort.java</url>
+          <url>file://$PROJECT_DIR$/data-structures/src/main/java/com/thealgorithm/array/IntQuickSort.java</url>
           <line>19</line>
           <option name="timeStamp" value="18" />
         </line-breakpoint>
         <line-breakpoint enabled="true" type="java-line">
-          <url>file://$PROJECT_DIR$/src/main/java/com/thealgorithm/graph/LeetCode2045.java</url>
+          <url>file://$PROJECT_DIR$/data-structures/src/main/java/com/thealgorithm/graph/LeetCode2045.java</url>
           <line>15</line>
           <option name="timeStamp" value="26" />
         </line-breakpoint>
         <line-breakpoint enabled="true" type="java-line">
-          <url>file://$PROJECT_DIR$/src/main/java/com/thealgorithm/array/matrix/JumpOnMatrix.java</url>
+          <url>file://$PROJECT_DIR$/data-structures/src/main/java/com/thealgorithm/array/matrix/JumpOnMatrix.java</url>
           <line>64</line>
           <option name="timeStamp" value="31" />
         </line-breakpoint>
         <line-breakpoint enabled="true" type="java-line">
-          <url>file://$PROJECT_DIR$/src/main/java/com/thealgorithm/array/matrix/SpiralIII.java</url>
+          <url>file://$PROJECT_DIR$/data-structures/src/main/java/com/thealgorithm/array/matrix/SpiralIII.java</url>
           <line>23</line>
           <option name="timeStamp" value="32" />
         </line-breakpoint>
         <line-breakpoint enabled="true" type="java-line">
-          <url>file://$PROJECT_DIR$/src/main/java/com/thealgorithm/stacks/CarFleet.java</url>
+          <url>file://$PROJECT_DIR$/data-structures/src/main/java/com/thealgorithm/stacks/CarFleet.java</url>
           <line>30</line>
           <option name="timeStamp" value="34" />
         </line-breakpoint>
         <line-breakpoint enabled="true" type="java-line">
-          <url>file://$PROJECT_DIR$/src/main/java/com/thealgorithm/strings/LongestSubstringLargeDatasize.java</url>
+          <url>file://$PROJECT_DIR$/data-structures/src/main/java/com/thealgorithm/strings/LongestSubstringLargeDatasize.java</url>
           <line>47</line>
           <option name="timeStamp" value="35" />
         </line-breakpoint>
         <line-breakpoint enabled="true" type="java-line">
-          <url>file://$PROJECT_DIR$/src/main/java/com/thealgorithm/stacks/LargestRectangleHistorgram.java</url>
+          <url>file://$PROJECT_DIR$/data-structures/src/main/java/com/thealgorithm/stacks/LargestRectangleHistorgram.java</url>
           <line>15</line>
           <option name="timeStamp" value="38" />
         </line-breakpoint>
         <line-breakpoint enabled="true" type="java-line">
-          <url>file://$PROJECT_DIR$/src/main/java/com/thealgorithm/graph/WordLadder.java</url>
+          <url>file://$PROJECT_DIR$/data-structures/src/main/java/com/thealgorithm/graph/WordLadder.java</url>
           <line>71</line>
           <option name="timeStamp" value="41" />
         </line-breakpoint>
+        <line-breakpoint enabled="true" type="java-line">
+          <url>file://$PROJECT_DIR$/data-structures/src/main/java/com/subham/tbpp/Main.java</url>
+          <line>15</line>
+          <option name="timeStamp" value="46" />
+        </line-breakpoint>
+        <line-breakpoint enabled="true" type="java-line">
+          <url>file://$PROJECT_DIR$/low-level-design/src/main/java/com/thealgorithm/Main.java</url>
+          <line>15</line>
+          <option name="timeStamp" value="47" />
+        </line-breakpoint>
         <line-breakpoint enabled="true" type="java-method">
-          <url>file://$PROJECT_DIR$/src/main/java/com/thealgorithm/graph/CoursesII.java</url>
+          <url>file://$PROJECT_DIR$/data-structures/src/main/java/com/thealgorithm/graph/CoursesII.java</url>
           <line>44</line>
           <properties class="com.thealgorithm.graph.CoursesII.Solution">
             <option name="EMULATED" value="true" />
@@ -555,9 +596,9 @@
           <option name="timeStamp" value="40" />
         </line-breakpoint>
         <line-breakpoint enabled="true" type="java-method">
-          <url>file://$PROJECT_DIR$/src/main/java/com/thealgorithm/backtracking/CombinationSumII.java</url>
+          <url>file://$PROJECT_DIR$/data-structures/src/main/java/com/thealgorithm/backtracking/CombinationSumII.java</url>
           <line>20</line>
-          <properties class="com.thealgorithm.backtracking.CombinationSumII.Solution" method="helper">
+          <properties class="com.thealgorithm.backtracking.CombinationSumII.Solution">
             <option name="EMULATED" value="true" />
             <option name="WATCH_EXIT" value="false" />
           </properties>
diff --git a/data-structures/pom.xml b/data-structures/pom.xml
new file mode 100644
index 0000000..ef14b77
--- /dev/null
+++ b/data-structures/pom.xml
@@ -0,0 +1,14 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<project xmlns="http://maven.apache.org/POM/4.0.0"
+         xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
+         xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
+    <modelVersion>4.0.0</modelVersion>
+    <parent>
+        <groupId>com.thealgorithm</groupId>
+        <artifactId>TheAlgorithm</artifactId>
+        <version>1.0-SNAPSHOT</version>
+    </parent>
+
+    <groupId>com.thealgorithm</groupId>
+    <artifactId>data-structures</artifactId>
+</project>
\ No newline at end of file
diff --git a/src/main/java/com/thealgorithm/Main.java b/data-structures/src/main/java/com/thealgorithm/Main.java
similarity index 100%
rename from src/main/java/com/thealgorithm/Main.java
rename to data-structures/src/main/java/com/thealgorithm/Main.java
diff --git a/src/main/java/com/thealgorithm/array/AGraphIsAValidTree.java b/data-structures/src/main/java/com/thealgorithm/array/AGraphIsAValidTree.java
similarity index 100%
rename from src/main/java/com/thealgorithm/array/AGraphIsAValidTree.java
rename to data-structures/src/main/java/com/thealgorithm/array/AGraphIsAValidTree.java
diff --git a/src/main/java/com/thealgorithm/array/IntQuickSort.java b/data-structures/src/main/java/com/thealgorithm/array/IntQuickSort.java
similarity index 100%
rename from src/main/java/com/thealgorithm/array/IntQuickSort.java
rename to data-structures/src/main/java/com/thealgorithm/array/IntQuickSort.java
diff --git a/src/main/java/com/thealgorithm/array/LeetCode1024Hard.java b/data-structures/src/main/java/com/thealgorithm/array/LeetCode1024Hard.java
similarity index 100%
rename from src/main/java/com/thealgorithm/array/LeetCode1024Hard.java
rename to data-structures/src/main/java/com/thealgorithm/array/LeetCode1024Hard.java
diff --git a/src/main/java/com/thealgorithm/array/LeetCode1605.java b/data-structures/src/main/java/com/thealgorithm/array/LeetCode1605.java
similarity index 100%
rename from src/main/java/com/thealgorithm/array/LeetCode1605.java
rename to data-structures/src/main/java/com/thealgorithm/array/LeetCode1605.java
diff --git a/src/main/java/com/thealgorithm/array/LeetCode1636.java b/data-structures/src/main/java/com/thealgorithm/array/LeetCode1636.java
similarity index 100%
rename from src/main/java/com/thealgorithm/array/LeetCode1636.java
rename to data-structures/src/main/java/com/thealgorithm/array/LeetCode1636.java
diff --git a/src/main/java/com/thealgorithm/array/LeetCode2191.java b/data-structures/src/main/java/com/thealgorithm/array/LeetCode2191.java
similarity index 100%
rename from src/main/java/com/thealgorithm/array/LeetCode2191.java
rename to data-structures/src/main/java/com/thealgorithm/array/LeetCode2191.java
diff --git a/src/main/java/com/thealgorithm/array/LeetCode2392.java b/data-structures/src/main/java/com/thealgorithm/array/LeetCode2392.java
similarity index 100%
rename from src/main/java/com/thealgorithm/array/LeetCode2392.java
rename to data-structures/src/main/java/com/thealgorithm/array/LeetCode2392.java
diff --git a/src/main/java/com/thealgorithm/array/NextPermutationFinder.java b/data-structures/src/main/java/com/thealgorithm/array/NextPermutationFinder.java
similarity index 100%
rename from src/main/java/com/thealgorithm/array/NextPermutationFinder.java
rename to data-structures/src/main/java/com/thealgorithm/array/NextPermutationFinder.java
diff --git a/src/main/java/com/thealgorithm/array/matrix/JumpOnMatrix.java b/data-structures/src/main/java/com/thealgorithm/array/matrix/JumpOnMatrix.java
similarity index 100%
rename from src/main/java/com/thealgorithm/array/matrix/JumpOnMatrix.java
rename to data-structures/src/main/java/com/thealgorithm/array/matrix/JumpOnMatrix.java
diff --git a/src/main/java/com/thealgorithm/array/matrix/SpiralIII.java b/data-structures/src/main/java/com/thealgorithm/array/matrix/SpiralIII.java
similarity index 100%
rename from src/main/java/com/thealgorithm/array/matrix/SpiralIII.java
rename to data-structures/src/main/java/com/thealgorithm/array/matrix/SpiralIII.java
diff --git a/src/main/java/com/thealgorithm/backtracking/CombinationSumI.java b/data-structures/src/main/java/com/thealgorithm/backtracking/CombinationSumI.java
similarity index 100%
rename from src/main/java/com/thealgorithm/backtracking/CombinationSumI.java
rename to data-structures/src/main/java/com/thealgorithm/backtracking/CombinationSumI.java
diff --git a/src/main/java/com/thealgorithm/backtracking/CombinationSumII.java b/data-structures/src/main/java/com/thealgorithm/backtracking/CombinationSumII.java
similarity index 100%
rename from src/main/java/com/thealgorithm/backtracking/CombinationSumII.java
rename to data-structures/src/main/java/com/thealgorithm/backtracking/CombinationSumII.java
diff --git a/src/main/java/com/thealgorithm/backtracking/PalindromePartitioning.java b/data-structures/src/main/java/com/thealgorithm/backtracking/PalindromePartitioning.java
similarity index 100%
rename from src/main/java/com/thealgorithm/backtracking/PalindromePartitioning.java
rename to data-structures/src/main/java/com/thealgorithm/backtracking/PalindromePartitioning.java
diff --git a/src/main/java/com/thealgorithm/backtracking/PermutationI.java b/data-structures/src/main/java/com/thealgorithm/backtracking/PermutationI.java
similarity index 100%
rename from src/main/java/com/thealgorithm/backtracking/PermutationI.java
rename to data-structures/src/main/java/com/thealgorithm/backtracking/PermutationI.java
diff --git a/src/main/java/com/thealgorithm/backtracking/Subsets.java b/data-structures/src/main/java/com/thealgorithm/backtracking/Subsets.java
similarity index 100%
rename from src/main/java/com/thealgorithm/backtracking/Subsets.java
rename to data-structures/src/main/java/com/thealgorithm/backtracking/Subsets.java
diff --git a/src/main/java/com/thealgorithm/backtracking/SubsetsII.java b/data-structures/src/main/java/com/thealgorithm/backtracking/SubsetsII.java
similarity index 100%
rename from src/main/java/com/thealgorithm/backtracking/SubsetsII.java
rename to data-structures/src/main/java/com/thealgorithm/backtracking/SubsetsII.java
diff --git a/src/main/java/com/thealgorithm/backtracking/WordSearch.java b/data-structures/src/main/java/com/thealgorithm/backtracking/WordSearch.java
similarity index 100%
rename from src/main/java/com/thealgorithm/backtracking/WordSearch.java
rename to data-structures/src/main/java/com/thealgorithm/backtracking/WordSearch.java
diff --git a/src/main/java/com/thealgorithm/commons/DesignAFoodRatingSystems.java b/data-structures/src/main/java/com/thealgorithm/commons/DesignAFoodRatingSystems.java
similarity index 100%
rename from src/main/java/com/thealgorithm/commons/DesignAFoodRatingSystems.java
rename to data-structures/src/main/java/com/thealgorithm/commons/DesignAFoodRatingSystems.java
diff --git a/src/main/java/com/thealgorithm/commons/Pair.java b/data-structures/src/main/java/com/thealgorithm/commons/Pair.java
similarity index 100%
rename from src/main/java/com/thealgorithm/commons/Pair.java
rename to data-structures/src/main/java/com/thealgorithm/commons/Pair.java
diff --git a/src/main/java/com/thealgorithm/commons/QuickSelect.java b/data-structures/src/main/java/com/thealgorithm/commons/QuickSelect.java
similarity index 100%
rename from src/main/java/com/thealgorithm/commons/QuickSelect.java
rename to data-structures/src/main/java/com/thealgorithm/commons/QuickSelect.java
diff --git a/src/main/java/com/thealgorithm/commons/SmallestInfiniteSet.java b/data-structures/src/main/java/com/thealgorithm/commons/SmallestInfiniteSet.java
similarity index 100%
rename from src/main/java/com/thealgorithm/commons/SmallestInfiniteSet.java
rename to data-structures/src/main/java/com/thealgorithm/commons/SmallestInfiniteSet.java
diff --git a/src/main/java/com/thealgorithm/competitive/CpTemplate.java b/data-structures/src/main/java/com/thealgorithm/competitive/CpTemplate.java
similarity index 100%
rename from src/main/java/com/thealgorithm/competitive/CpTemplate.java
rename to data-structures/src/main/java/com/thealgorithm/competitive/CpTemplate.java
diff --git a/src/main/java/com/thealgorithm/concurr/que/IQueue.java b/data-structures/src/main/java/com/thealgorithm/concurr/que/IQueue.java
similarity index 100%
rename from src/main/java/com/thealgorithm/concurr/que/IQueue.java
rename to data-structures/src/main/java/com/thealgorithm/concurr/que/IQueue.java
diff --git a/src/main/java/com/thealgorithm/concurr/que/QueueTest.java b/data-structures/src/main/java/com/thealgorithm/concurr/que/QueueTest.java
similarity index 100%
rename from src/main/java/com/thealgorithm/concurr/que/QueueTest.java
rename to data-structures/src/main/java/com/thealgorithm/concurr/que/QueueTest.java
diff --git a/src/main/java/com/thealgorithm/concurr/que/SimpleBlockingQueue.java b/data-structures/src/main/java/com/thealgorithm/concurr/que/SimpleBlockingQueue.java
similarity index 100%
rename from src/main/java/com/thealgorithm/concurr/que/SimpleBlockingQueue.java
rename to data-structures/src/main/java/com/thealgorithm/concurr/que/SimpleBlockingQueue.java
diff --git a/src/main/java/com/thealgorithm/dp/Leetcode907.java b/data-structures/src/main/java/com/thealgorithm/dp/Leetcode907.java
similarity index 100%
rename from src/main/java/com/thealgorithm/dp/Leetcode907.java
rename to data-structures/src/main/java/com/thealgorithm/dp/Leetcode907.java
diff --git a/src/main/java/com/thealgorithm/dp/lcs/LongestCommonSubsequence.java b/data-structures/src/main/java/com/thealgorithm/dp/lcs/LongestCommonSubsequence.java
similarity index 100%
rename from src/main/java/com/thealgorithm/dp/lcs/LongestCommonSubsequence.java
rename to data-structures/src/main/java/com/thealgorithm/dp/lcs/LongestCommonSubsequence.java
diff --git a/src/main/java/com/thealgorithm/dp/lis/Leetcode1653.java b/data-structures/src/main/java/com/thealgorithm/dp/lis/Leetcode1653.java
similarity index 100%
rename from src/main/java/com/thealgorithm/dp/lis/Leetcode1653.java
rename to data-structures/src/main/java/com/thealgorithm/dp/lis/Leetcode1653.java
diff --git a/src/main/java/com/thealgorithm/graph/ArticulationPointOnDirectedGraph.java b/data-structures/src/main/java/com/thealgorithm/graph/ArticulationPointOnDirectedGraph.java
similarity index 100%
rename from src/main/java/com/thealgorithm/graph/ArticulationPointOnDirectedGraph.java
rename to data-structures/src/main/java/com/thealgorithm/graph/ArticulationPointOnDirectedGraph.java
diff --git a/src/main/java/com/thealgorithm/graph/CloneGraph.java b/data-structures/src/main/java/com/thealgorithm/graph/CloneGraph.java
similarity index 100%
rename from src/main/java/com/thealgorithm/graph/CloneGraph.java
rename to data-structures/src/main/java/com/thealgorithm/graph/CloneGraph.java
diff --git a/src/main/java/com/thealgorithm/graph/CollectCoinsInATree.java b/data-structures/src/main/java/com/thealgorithm/graph/CollectCoinsInATree.java
similarity index 100%
rename from src/main/java/com/thealgorithm/graph/CollectCoinsInATree.java
rename to data-structures/src/main/java/com/thealgorithm/graph/CollectCoinsInATree.java
diff --git a/src/main/java/com/thealgorithm/graph/CoursesII.java b/data-structures/src/main/java/com/thealgorithm/graph/CoursesII.java
similarity index 100%
rename from src/main/java/com/thealgorithm/graph/CoursesII.java
rename to data-structures/src/main/java/com/thealgorithm/graph/CoursesII.java
diff --git a/src/main/java/com/thealgorithm/graph/Edge.java b/data-structures/src/main/java/com/thealgorithm/graph/Edge.java
similarity index 100%
rename from src/main/java/com/thealgorithm/graph/Edge.java
rename to data-structures/src/main/java/com/thealgorithm/graph/Edge.java
diff --git a/src/main/java/com/thealgorithm/graph/FloydWarshallAlgorithm.java b/data-structures/src/main/java/com/thealgorithm/graph/FloydWarshallAlgorithm.java
similarity index 100%
rename from src/main/java/com/thealgorithm/graph/FloydWarshallAlgorithm.java
rename to data-structures/src/main/java/com/thealgorithm/graph/FloydWarshallAlgorithm.java
diff --git a/src/main/java/com/thealgorithm/graph/Graph.java b/data-structures/src/main/java/com/thealgorithm/graph/Graph.java
similarity index 100%
rename from src/main/java/com/thealgorithm/graph/Graph.java
rename to data-structures/src/main/java/com/thealgorithm/graph/Graph.java
diff --git a/src/main/java/com/thealgorithm/graph/IslandsAndTreasures.java b/data-structures/src/main/java/com/thealgorithm/graph/IslandsAndTreasures.java
similarity index 100%
rename from src/main/java/com/thealgorithm/graph/IslandsAndTreasures.java
rename to data-structures/src/main/java/com/thealgorithm/graph/IslandsAndTreasures.java
diff --git a/src/main/java/com/thealgorithm/graph/LeetCode2045.java b/data-structures/src/main/java/com/thealgorithm/graph/LeetCode2045.java
similarity index 100%
rename from src/main/java/com/thealgorithm/graph/LeetCode2045.java
rename to data-structures/src/main/java/com/thealgorithm/graph/LeetCode2045.java
diff --git a/src/main/java/com/thealgorithm/graph/LeetCode2976.java b/data-structures/src/main/java/com/thealgorithm/graph/LeetCode2976.java
similarity index 100%
rename from src/main/java/com/thealgorithm/graph/LeetCode2976.java
rename to data-structures/src/main/java/com/thealgorithm/graph/LeetCode2976.java
diff --git a/src/main/java/com/thealgorithm/graph/MostStonesRemovedSameRowCol.java b/data-structures/src/main/java/com/thealgorithm/graph/MostStonesRemovedSameRowCol.java
similarity index 100%
rename from src/main/java/com/thealgorithm/graph/MostStonesRemovedSameRowCol.java
rename to data-structures/src/main/java/com/thealgorithm/graph/MostStonesRemovedSameRowCol.java
diff --git a/src/main/java/com/thealgorithm/graph/PacificAtlanticWaterFlow.java b/data-structures/src/main/java/com/thealgorithm/graph/PacificAtlanticWaterFlow.java
similarity index 100%
rename from src/main/java/com/thealgorithm/graph/PacificAtlanticWaterFlow.java
rename to data-structures/src/main/java/com/thealgorithm/graph/PacificAtlanticWaterFlow.java
diff --git a/src/main/java/com/thealgorithm/graph/PrimsMinimumSpanningTree.java b/data-structures/src/main/java/com/thealgorithm/graph/PrimsMinimumSpanningTree.java
similarity index 100%
rename from src/main/java/com/thealgorithm/graph/PrimsMinimumSpanningTree.java
rename to data-structures/src/main/java/com/thealgorithm/graph/PrimsMinimumSpanningTree.java
diff --git a/src/main/java/com/thealgorithm/graph/ShortestCycleInGraph.java b/data-structures/src/main/java/com/thealgorithm/graph/ShortestCycleInGraph.java
similarity index 100%
rename from src/main/java/com/thealgorithm/graph/ShortestCycleInGraph.java
rename to data-structures/src/main/java/com/thealgorithm/graph/ShortestCycleInGraph.java
diff --git a/src/main/java/com/thealgorithm/graph/TopologicalSort.java b/data-structures/src/main/java/com/thealgorithm/graph/TopologicalSort.java
similarity index 100%
rename from src/main/java/com/thealgorithm/graph/TopologicalSort.java
rename to data-structures/src/main/java/com/thealgorithm/graph/TopologicalSort.java
diff --git a/src/main/java/com/thealgorithm/graph/Vertex.java b/data-structures/src/main/java/com/thealgorithm/graph/Vertex.java
similarity index 100%
rename from src/main/java/com/thealgorithm/graph/Vertex.java
rename to data-structures/src/main/java/com/thealgorithm/graph/Vertex.java
diff --git a/src/main/java/com/thealgorithm/graph/WordLadder.java b/data-structures/src/main/java/com/thealgorithm/graph/WordLadder.java
similarity index 100%
rename from src/main/java/com/thealgorithm/graph/WordLadder.java
rename to data-structures/src/main/java/com/thealgorithm/graph/WordLadder.java
diff --git a/src/main/java/com/thealgorithm/hashtable/LeetCode17.java b/data-structures/src/main/java/com/thealgorithm/hashtable/LeetCode17.java
similarity index 100%
rename from src/main/java/com/thealgorithm/hashtable/LeetCode17.java
rename to data-structures/src/main/java/com/thealgorithm/hashtable/LeetCode17.java
diff --git a/src/main/java/com/thealgorithm/lld/DatabaseLocks.java b/data-structures/src/main/java/com/thealgorithm/lld/DatabaseLocks.java
similarity index 100%
rename from src/main/java/com/thealgorithm/lld/DatabaseLocks.java
rename to data-structures/src/main/java/com/thealgorithm/lld/DatabaseLocks.java
diff --git a/src/main/java/com/thealgorithm/lld/ParkingLotLLD.java b/data-structures/src/main/java/com/thealgorithm/lld/ParkingLotLLD.java
similarity index 100%
rename from src/main/java/com/thealgorithm/lld/ParkingLotLLD.java
rename to data-structures/src/main/java/com/thealgorithm/lld/ParkingLotLLD.java
diff --git a/src/main/java/com/thealgorithm/lld/SimpleRateLimiter.java b/data-structures/src/main/java/com/thealgorithm/lld/SimpleRateLimiter.java
similarity index 100%
rename from src/main/java/com/thealgorithm/lld/SimpleRateLimiter.java
rename to data-structures/src/main/java/com/thealgorithm/lld/SimpleRateLimiter.java
diff --git a/data-structures/src/main/java/com/thealgorithm/miscelleneous/GenerateParenthesis.java b/data-structures/src/main/java/com/thealgorithm/miscelleneous/GenerateParenthesis.java
new file mode 100644
index 0000000..eb3583b
--- /dev/null
+++ b/data-structures/src/main/java/com/thealgorithm/miscelleneous/GenerateParenthesis.java
@@ -0,0 +1,77 @@
+package com.thealgorithm.miscelleneous;
+
+import java.util.ArrayList;
+import java.util.HashSet;
+import java.util.List;
+import java.util.Set;
+
+/**
+ * @author: Subham Santra
+ */
+public class GenerateParenthesis {
+
+  public List<String> generate(int c1, int c2, int c3) {
+    Set<String> result = new HashSet<>();
+    generate(c1, 0, 0, c2, 0, 0, c3, 0, 0, result, new StringBuilder());
+    return new ArrayList<>(result);
+  }
+
+  private void generate(
+      int c1,
+      int o1,
+      int e1,
+      int c2,
+      int o2,
+      int e2,
+      int c3,
+      int o3,
+      int e3,
+      Set<String> result,
+      StringBuilder comb) {
+
+    if (e1 > o1 || e2 > o2 || e3 > o3) {
+      return;
+    }
+
+    //        if (o1 == c1 && o1 == e1 && o2 == c2 && o2 == e2 && o3 == c3 && o3 == e3) {
+    if (o1 == c1 && o2 == c2 && o3 == c3) {
+      //    if (o1 == e1 && o2 == e2 && o3 == e3) {
+      result.add(comb.toString());
+      return;
+    }
+
+    if (o1 < c1) {
+      comb.append('(');
+      generate(c1, o1 + 1, e1, c2, o2, e2, c3, o3, e3, result, comb);
+      comb.deleteCharAt(comb.length() - 1);
+
+      comb.append(')');
+      generate(c1, o1, e1 + 1, c2, o2, e2, c3, o3, e3, result, comb);
+      comb.deleteCharAt(comb.length() - 1);
+    }
+
+    if (o2 < c2) {
+      comb.append('{');
+      generate(c1, o1, e1, c2, o2 + 1, e2, c3, o3, e3, result, comb);
+      comb.deleteCharAt(comb.length() - 1);
+
+      comb.append('}');
+      generate(c1, o1, e1, c2, o2, e2 + 1, c3, o3, e3, result, comb);
+      comb.deleteCharAt(comb.length() - 1);
+    }
+
+    if (o3 < c3) {
+      comb.append('[');
+      generate(c1, o1, e1, c2, o2, e2, c3, o3 + 1, e3, result, comb);
+      comb.deleteCharAt(comb.length() - 1);
+
+      comb.append(']');
+      generate(c1, o1 + 1, e1, c2, o2, e2, c3, o3, e3 + 1, result, comb);
+      comb.deleteCharAt(comb.length() - 1);
+    }
+  }
+
+  public static void main(String[] args) {
+    System.out.println(new GenerateParenthesis().generate(2, 2, 2));
+  }
+}
diff --git a/src/main/java/com/thealgorithm/dp/miscelleneous/LeetCode1155.java b/data-structures/src/main/java/com/thealgorithm/miscelleneous/LeetCode1155.java
similarity index 97%
rename from src/main/java/com/thealgorithm/dp/miscelleneous/LeetCode1155.java
rename to data-structures/src/main/java/com/thealgorithm/miscelleneous/LeetCode1155.java
index 360667e..5e556bf 100644
--- a/src/main/java/com/thealgorithm/dp/miscelleneous/LeetCode1155.java
+++ b/data-structures/src/main/java/com/thealgorithm/miscelleneous/LeetCode1155.java
@@ -1,4 +1,4 @@
-package com.thealgorithm.dp.miscelleneous;
+package com.thealgorithm.miscelleneous;
 
 /**
  * @see <a
diff --git a/src/main/java/com/thealgorithm/dp/miscelleneous/LeetCode1235.java b/data-structures/src/main/java/com/thealgorithm/miscelleneous/LeetCode1235.java
similarity index 98%
rename from src/main/java/com/thealgorithm/dp/miscelleneous/LeetCode1235.java
rename to data-structures/src/main/java/com/thealgorithm/miscelleneous/LeetCode1235.java
index f5c75cd..cce09a2 100644
--- a/src/main/java/com/thealgorithm/dp/miscelleneous/LeetCode1235.java
+++ b/data-structures/src/main/java/com/thealgorithm/miscelleneous/LeetCode1235.java
@@ -1,4 +1,4 @@
-package com.thealgorithm.dp.miscelleneous;
+package com.thealgorithm.miscelleneous;
 
 import java.util.Arrays;
 
diff --git a/src/main/java/com/thealgorithm/dp/miscelleneous/LeetCode1335.java b/data-structures/src/main/java/com/thealgorithm/miscelleneous/LeetCode1335.java
similarity index 98%
rename from src/main/java/com/thealgorithm/dp/miscelleneous/LeetCode1335.java
rename to data-structures/src/main/java/com/thealgorithm/miscelleneous/LeetCode1335.java
index 9e3c58d..1b9fa8b 100644
--- a/src/main/java/com/thealgorithm/dp/miscelleneous/LeetCode1335.java
+++ b/data-structures/src/main/java/com/thealgorithm/miscelleneous/LeetCode1335.java
@@ -1,4 +1,4 @@
-package com.thealgorithm.dp.miscelleneous;
+package com.thealgorithm.miscelleneous;
 
 import java.util.Arrays;
 
diff --git a/src/main/java/com/thealgorithm/dp/miscelleneous/LeetCode446.java b/data-structures/src/main/java/com/thealgorithm/miscelleneous/LeetCode446.java
similarity index 97%
rename from src/main/java/com/thealgorithm/dp/miscelleneous/LeetCode446.java
rename to data-structures/src/main/java/com/thealgorithm/miscelleneous/LeetCode446.java
index 7f98278..6774203 100644
--- a/src/main/java/com/thealgorithm/dp/miscelleneous/LeetCode446.java
+++ b/data-structures/src/main/java/com/thealgorithm/miscelleneous/LeetCode446.java
@@ -1,4 +1,4 @@
-package com.thealgorithm.dp.miscelleneous;
+package com.thealgorithm.miscelleneous;
 
 import java.util.ArrayList;
 import java.util.HashMap;
diff --git a/src/main/java/com/thealgorithm/rxdemo/RxDemo1.java b/data-structures/src/main/java/com/thealgorithm/rxdemo/RxDemo1.java
similarity index 100%
rename from src/main/java/com/thealgorithm/rxdemo/RxDemo1.java
rename to data-structures/src/main/java/com/thealgorithm/rxdemo/RxDemo1.java
diff --git a/src/main/java/com/thealgorithm/stackqueue/EvaluateReversePolish.java b/data-structures/src/main/java/com/thealgorithm/stackqueue/EvaluateReversePolish.java
similarity index 100%
rename from src/main/java/com/thealgorithm/stackqueue/EvaluateReversePolish.java
rename to data-structures/src/main/java/com/thealgorithm/stackqueue/EvaluateReversePolish.java
diff --git a/src/main/java/com/thealgorithm/stackqueue/LeetCode121.java b/data-structures/src/main/java/com/thealgorithm/stackqueue/LeetCode121.java
similarity index 100%
rename from src/main/java/com/thealgorithm/stackqueue/LeetCode121.java
rename to data-structures/src/main/java/com/thealgorithm/stackqueue/LeetCode121.java
diff --git a/src/main/java/com/thealgorithm/stacks/CarFleet.java b/data-structures/src/main/java/com/thealgorithm/stacks/CarFleet.java
similarity index 100%
rename from src/main/java/com/thealgorithm/stacks/CarFleet.java
rename to data-structures/src/main/java/com/thealgorithm/stacks/CarFleet.java
diff --git a/src/main/java/com/thealgorithm/stacks/LargestRectangleHistorgram.java b/data-structures/src/main/java/com/thealgorithm/stacks/LargestRectangleHistorgram.java
similarity index 100%
rename from src/main/java/com/thealgorithm/stacks/LargestRectangleHistorgram.java
rename to data-structures/src/main/java/com/thealgorithm/stacks/LargestRectangleHistorgram.java
diff --git a/src/main/java/com/thealgorithm/stacks/LargestSubMatrixWithRearrangements.java b/data-structures/src/main/java/com/thealgorithm/stacks/LargestSubMatrixWithRearrangements.java
similarity index 100%
rename from src/main/java/com/thealgorithm/stacks/LargestSubMatrixWithRearrangements.java
rename to data-structures/src/main/java/com/thealgorithm/stacks/LargestSubMatrixWithRearrangements.java
diff --git a/src/main/java/com/thealgorithm/stacks/MaximumRectangle2DMatrix.java b/data-structures/src/main/java/com/thealgorithm/stacks/MaximumRectangle2DMatrix.java
similarity index 100%
rename from src/main/java/com/thealgorithm/stacks/MaximumRectangle2DMatrix.java
rename to data-structures/src/main/java/com/thealgorithm/stacks/MaximumRectangle2DMatrix.java
diff --git a/src/main/java/com/thealgorithm/strings/LeetCode1239.java b/data-structures/src/main/java/com/thealgorithm/strings/LeetCode1239.java
similarity index 100%
rename from src/main/java/com/thealgorithm/strings/LeetCode1239.java
rename to data-structures/src/main/java/com/thealgorithm/strings/LeetCode1239.java
diff --git a/src/main/java/com/thealgorithm/strings/LeetCode1624.java b/data-structures/src/main/java/com/thealgorithm/strings/LeetCode1624.java
similarity index 100%
rename from src/main/java/com/thealgorithm/strings/LeetCode1624.java
rename to data-structures/src/main/java/com/thealgorithm/strings/LeetCode1624.java
diff --git a/src/main/java/com/thealgorithm/strings/LongestRepeatingCharacterReplacement.java b/data-structures/src/main/java/com/thealgorithm/strings/LongestRepeatingCharacterReplacement.java
similarity index 100%
rename from src/main/java/com/thealgorithm/strings/LongestRepeatingCharacterReplacement.java
rename to data-structures/src/main/java/com/thealgorithm/strings/LongestRepeatingCharacterReplacement.java
diff --git a/src/main/java/com/thealgorithm/strings/LongestSubstringLargeDatasize.java b/data-structures/src/main/java/com/thealgorithm/strings/LongestSubstringLargeDatasize.java
similarity index 100%
rename from src/main/java/com/thealgorithm/strings/LongestSubstringLargeDatasize.java
rename to data-structures/src/main/java/com/thealgorithm/strings/LongestSubstringLargeDatasize.java
diff --git a/src/main/java/com/thealgorithm/tree/LeetCode2385.java b/data-structures/src/main/java/com/thealgorithm/tree/LeetCode2385.java
similarity index 100%
rename from src/main/java/com/thealgorithm/tree/LeetCode2385.java
rename to data-structures/src/main/java/com/thealgorithm/tree/LeetCode2385.java
diff --git a/src/main/resources/graph/LC_200_number_of_islands.txt b/data-structures/src/main/resources/graph/LC_200_number_of_islands.txt
similarity index 100%
rename from src/main/resources/graph/LC_200_number_of_islands.txt
rename to data-structures/src/main/resources/graph/LC_200_number_of_islands.txt
diff --git a/low-level-design/pom.xml b/low-level-design/pom.xml
new file mode 100644
index 0000000..12559a1
--- /dev/null
+++ b/low-level-design/pom.xml
@@ -0,0 +1,14 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<project xmlns="http://maven.apache.org/POM/4.0.0"
+         xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
+         xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
+    <modelVersion>4.0.0</modelVersion>
+    <parent>
+        <groupId>com.thealgorithm</groupId>
+        <artifactId>TheAlgorithm</artifactId>
+        <version>1.0-SNAPSHOT</version>
+    </parent>
+
+    <groupId>com.thealgorithm</groupId>
+    <artifactId>low-level-design</artifactId>
+</project>
\ No newline at end of file
diff --git a/low-level-design/src/main/java/com/thealgorithm/caching/CachingLocalTest.java b/low-level-design/src/main/java/com/thealgorithm/caching/CachingLocalTest.java
new file mode 100644
index 0000000..d3d03a9
--- /dev/null
+++ b/low-level-design/src/main/java/com/thealgorithm/caching/CachingLocalTest.java
@@ -0,0 +1,42 @@
+package com.thealgorithm.caching;
+
+import java.nio.charset.StandardCharsets;
+import java.util.Scanner;
+import java.util.StringTokenizer;
+
+/**
+ * @author: Subham Santra
+ */
+public class CachingLocalTest {
+  public static void main(String[] args) {
+    InMemoryKeyValStore keyValStore = InMemoryKeyValStore.create();
+    try (Scanner scanner = new Scanner(System.in)) {
+
+      do {
+        String line = scanner.nextLine();
+        StringTokenizer tokenizer = new StringTokenizer(line);
+
+        String var1 = tokenizer.nextToken();
+        String var2 = tokenizer.nextToken();
+        String var3 = tokenizer.hasMoreTokens() ? tokenizer.nextToken() : "";
+        String var4 = tokenizer.hasMoreTokens() ? tokenizer.nextToken() : "";
+
+        try {
+          if (var1.equalsIgnoreCase("put")) {
+            if (var4.isBlank()) {
+              keyValStore.put(var2, var3.getBytes(StandardCharsets.UTF_8), 60_000L);
+            } else {
+              keyValStore.put(var2, var3.getBytes(StandardCharsets.UTF_8), Long.parseLong(var4));
+            }
+          } else if (var1.equalsIgnoreCase("get")) {
+            System.out.println(new String(keyValStore.get(var2)));
+          } else if (var1.equalsIgnoreCase("rem")) {
+            keyValStore.rem(var2);
+          }
+        } catch (DataNotPresentException | DataExpiredException e) {
+          System.err.println(e.getMessage());
+        }
+      } while (scanner.hasNextLine());
+    }
+  }
+}
diff --git a/low-level-design/src/main/java/com/thealgorithm/caching/DataExpiredException.java b/low-level-design/src/main/java/com/thealgorithm/caching/DataExpiredException.java
new file mode 100644
index 0000000..b3ff075
--- /dev/null
+++ b/low-level-design/src/main/java/com/thealgorithm/caching/DataExpiredException.java
@@ -0,0 +1,10 @@
+package com.thealgorithm.caching;
+
+/**
+ * @author: Subham Santra
+ */
+public class DataExpiredException extends Exception {
+  public DataExpiredException(String s) {
+    super(s);
+  }
+}
diff --git a/low-level-design/src/main/java/com/thealgorithm/caching/DataNotPresentException.java b/low-level-design/src/main/java/com/thealgorithm/caching/DataNotPresentException.java
new file mode 100644
index 0000000..20da561
--- /dev/null
+++ b/low-level-design/src/main/java/com/thealgorithm/caching/DataNotPresentException.java
@@ -0,0 +1,10 @@
+package com.thealgorithm.caching;
+
+/**
+ * @author: Subham Santra
+ */
+public class DataNotPresentException extends Exception {
+  public DataNotPresentException(String s) {
+    super(s);
+  }
+}
diff --git a/low-level-design/src/main/java/com/thealgorithm/caching/InMemoryKeyValStore.java b/low-level-design/src/main/java/com/thealgorithm/caching/InMemoryKeyValStore.java
new file mode 100644
index 0000000..a520f29
--- /dev/null
+++ b/low-level-design/src/main/java/com/thealgorithm/caching/InMemoryKeyValStore.java
@@ -0,0 +1,60 @@
+package com.thealgorithm.caching;
+
+import java.util.Map;
+import java.util.concurrent.ConcurrentHashMap;
+import lombok.Value;
+
+/**
+ * @author: Subham Santra
+ * @apiNote
+ *     <li>$ put key val
+ *     <li>$ put key val ttl_in_seconds
+ *     <li>$ get key
+ *     <li>$ rem key
+ */
+public class InMemoryKeyValStore {
+  @Value
+  private static class Entry {
+    byte[] val;
+    long created;
+    long ttl_millis;
+  }
+
+  private final Map<String, Entry> kvStore;
+
+  private InMemoryKeyValStore() {
+    kvStore = new ConcurrentHashMap<>();
+  }
+
+  public static InMemoryKeyValStore create() {
+    return new InMemoryKeyValStore();
+  }
+
+  void put(String key, byte[] val, long ttl) {
+    kvStore.put(key, new Entry(val, System.currentTimeMillis(), ttl));
+  }
+
+  byte[] get(String key) throws DataNotPresentException, DataExpiredException {
+    if (!kvStore.containsKey(key)) {
+      throw new DataNotPresentException("'key' : " + key + " do not present");
+    }
+
+    Entry e = kvStore.get(key);
+    if (System.currentTimeMillis() - e.created > e.ttl_millis) {
+      kvStore.remove(key);
+      throw new DataExpiredException("'key' : " + key + " expired");
+    }
+
+    return e.val;
+  }
+
+  boolean rem(String key) throws DataNotPresentException, DataExpiredException {
+    if (!kvStore.containsKey(key)) {
+      throw new DataNotPresentException("'key' : " + key + " do not present");
+    }
+
+    Entry e = kvStore.get(key);
+    kvStore.remove(key);
+    return (System.currentTimeMillis() - e.created <= e.ttl_millis);
+  }
+}
diff --git a/pom.xml b/pom.xml
index 558cbd1..ac7e077 100644
--- a/pom.xml
+++ b/pom.xml
@@ -7,6 +7,11 @@
     <groupId>com.thealgorithm</groupId>
     <artifactId>TheAlgorithm</artifactId>
     <version>1.0-SNAPSHOT</version>
+    <packaging>pom</packaging>
+    <modules>
+        <module>data-structures</module>
+        <module>low-level-design</module>
+    </modules>
 
     <properties>
         <maven.compiler.source>21</maven.compiler.source>