diff --git a/GPT-tokenizer-dotnet/Lib/GPT3Tokenizer.cs b/GPT-tokenizer-dotnet/Lib/GPT3Tokenizer.cs
index d624ece..3495d30 100644
--- a/GPT-tokenizer-dotnet/Lib/GPT3Tokenizer.cs
+++ b/GPT-tokenizer-dotnet/Lib/GPT3Tokenizer.cs
@@ -6,7 +6,7 @@
 using System.Linq;
 using System.Text;
 using System.Text.RegularExpressions;
-using AI.Dev.OpenAI.GPT.GPT3Settings;
+using AI.Dev.OpenAI.GPT.Settings;
 
 namespace AI.Dev.OpenAI.GPT
 {
@@ -17,6 +17,7 @@ public static class GPT3Tokenizer
 
         public static List<int> Encode(string text)
         {
+            if (string.IsNullOrEmpty(text)) return new List<int>();
             Dictionary<int, char> byteEncoder = BytesToUnicode();
 
             string pat = @"'s|'t|'re|'ve|'m|'ll|'d| ?\p{L}+| ?\p{N}+| ?[^\s\p{L}\p{N}]+|\s+(?!\S)|\s+";
@@ -26,13 +27,28 @@ public static List<int> Encode(string text)
             foreach (Match? match in matches)
             {
                 string token = new string(Encoding.UTF8.GetBytes(match!.Value).Select(x => byteEncoder[x]).ToArray());
-                List<int> newTokens = BytePairEncoding(token).Split(' ').Select(x => Settings.Encoder[x]).ToList();
+                List<int> newTokens = BytePairEncoding(token).Split(' ').Select(x => GPT3Settings.Encoder[x]).ToList();
                 bpeTokens.AddRange(newTokens);
             }
 
             return bpeTokens;
         }
 
+        public static List<int> Encode(StringBuilder? stringBuilder)
+        {
+            return stringBuilder == null ? new List<int>() : Encode(stringBuilder.ToString());
+        }
+
+        public static List<int> Encode(char[]? chars)
+        {
+            return chars == null ? new List<int>() : Encode(new string(chars));
+        }
+
+        public static List<int> Encode(IEnumerable<char>? chars)
+        {
+            return chars == null ? new List<int>() : Encode(chars.ToArray());
+        }
+
         private static int Ord(string x) => char.ConvertToUtf32(x, 0);
 
         private static Dictionary<int, char> BytesToUnicode()
@@ -79,9 +95,9 @@ private static string BytePairEncoding(string token)
                 var minPairs = new SortedDictionary<long, Tuple<string, string>>();
                 foreach (Tuple<string, string> pair in pairs)
                 {
-                    if (Settings.BpeRanks.ContainsKey(pair))
+                    if (GPT3Settings.BpeRanks.ContainsKey(pair))
                     {
-                        int rank = Settings.BpeRanks[pair];
+                        int rank = GPT3Settings.BpeRanks[pair];
                         minPairs[rank] = pair;
                     }
                     else
@@ -91,7 +107,7 @@ private static string BytePairEncoding(string token)
                 }
 
                 Tuple<string, string> biGram = minPairs[minPairs.Keys.Min()];
-                if (!Settings.BpeRanks.ContainsKey(biGram)) break;
+                if (!GPT3Settings.BpeRanks.ContainsKey(biGram)) break;
 
                 string first = biGram.Item1;
                 string second = biGram.Item2;
diff --git a/GPT-tokenizer-dotnet/Lib/Lib.csproj b/GPT-tokenizer-dotnet/Lib/Lib.csproj
index 0da1180..ef1c97f 100644
--- a/GPT-tokenizer-dotnet/Lib/Lib.csproj
+++ b/GPT-tokenizer-dotnet/Lib/Lib.csproj
@@ -14,12 +14,12 @@
         <Title>OpenAI GPT utils</Title>
         <Description>OpenAI GPT utils, e.g. GPT3 Tokenizer</Description>
         <Copyright>Devis Lucato</Copyright>
-        <PackageVersion>1.0.1</PackageVersion>
+        <PackageVersion>1.0.2</PackageVersion>
     </PropertyGroup>
 
     <ItemGroup>
-        <EmbeddedResource Include="GPT3Settings\encoder.json" />
-        <EmbeddedResource Include="GPT3Settings\vocab.bpe" />
+        <EmbeddedResource Include="Settings\encoder.json" />
+        <EmbeddedResource Include="Settings\vocab.bpe" />
     </ItemGroup>
 
 </Project>
diff --git a/GPT-tokenizer-dotnet/Lib/GPT3Settings/EmbeddedResource.cs b/GPT-tokenizer-dotnet/Lib/Settings/EmbeddedResource.cs
similarity index 95%
rename from GPT-tokenizer-dotnet/Lib/GPT3Settings/EmbeddedResource.cs
rename to GPT-tokenizer-dotnet/Lib/Settings/EmbeddedResource.cs
index 9ac8f7e..8dca6d1 100644
--- a/GPT-tokenizer-dotnet/Lib/GPT3Settings/EmbeddedResource.cs
+++ b/GPT-tokenizer-dotnet/Lib/Settings/EmbeddedResource.cs
@@ -4,7 +4,7 @@
 using System.IO;
 using System.Reflection;
 
-namespace AI.Dev.OpenAI.GPT.GPT3Settings
+namespace AI.Dev.OpenAI.GPT.Settings
 {
     internal static class EmbeddedResource
     {
diff --git a/GPT-tokenizer-dotnet/Lib/GPT3Settings/Settings.cs b/GPT-tokenizer-dotnet/Lib/Settings/GPT3Settings.cs
similarity index 92%
rename from GPT-tokenizer-dotnet/Lib/GPT3Settings/Settings.cs
rename to GPT-tokenizer-dotnet/Lib/Settings/GPT3Settings.cs
index b45ec7a..291b0fb 100644
--- a/GPT-tokenizer-dotnet/Lib/GPT3Settings/Settings.cs
+++ b/GPT-tokenizer-dotnet/Lib/Settings/GPT3Settings.cs
@@ -1,20 +1,20 @@
 // @author: Devis Lucato. @license: CC0.
 
-using System.Text.Json;
-using System.Collections.Generic;
 using System;
+using System.Collections.Generic;
 using System.Linq;
+using System.Text.Json;
 
-namespace AI.Dev.OpenAI.GPT.GPT3Settings
+namespace AI.Dev.OpenAI.GPT.Settings
 {
-    internal static class Settings
+    internal static class GPT3Settings
     {
         internal static Dictionary<string, int> Encoder => ENCODER.Value;
         internal static Dictionary<Tuple<string, string>, int> BpeRanks => BPE_RANKS.Value;
 
         private static readonly Lazy<Dictionary<string, int>> ENCODER = new Lazy<Dictionary<string, int>>(BuildEncoder);
         private static readonly Lazy<Dictionary<Tuple<string, string>, int>> BPE_RANKS = new Lazy<Dictionary<Tuple<string, string>, int>>(BuildBpeRanks);
-        private static readonly string? NAMESPACE = typeof(Settings).Namespace;
+        private static readonly string? NAMESPACE = typeof(GPT3Settings).Namespace;
 
         private static Dictionary<Tuple<string, string>, int> BuildBpeRanks()
         {
diff --git a/GPT-tokenizer-dotnet/Lib/GPT3Settings/encoder.json b/GPT-tokenizer-dotnet/Lib/Settings/encoder.json
similarity index 100%
rename from GPT-tokenizer-dotnet/Lib/GPT3Settings/encoder.json
rename to GPT-tokenizer-dotnet/Lib/Settings/encoder.json
diff --git a/GPT-tokenizer-dotnet/Lib/GPT3Settings/vocab.bpe b/GPT-tokenizer-dotnet/Lib/Settings/vocab.bpe
similarity index 100%
rename from GPT-tokenizer-dotnet/Lib/GPT3Settings/vocab.bpe
rename to GPT-tokenizer-dotnet/Lib/Settings/vocab.bpe
diff --git a/GPT-tokenizer-dotnet/Tests/GPT3TokenizerTests.cs b/GPT-tokenizer-dotnet/Tests/GPT3TokenizerTests.cs
index c4de64d..2a6827f 100644
--- a/GPT-tokenizer-dotnet/Tests/GPT3TokenizerTests.cs
+++ b/GPT-tokenizer-dotnet/Tests/GPT3TokenizerTests.cs
@@ -1,6 +1,8 @@
 // @author: Devis Lucato. @license: CC0.
 
 using System.Collections.Generic;
+using System.Linq;
+using System.Text;
 using System.Text.Json;
 using AI.Dev.OpenAI.GPT;
 using Xunit;
@@ -28,9 +30,14 @@ public class GPT3TokenizerTests
 es una forma efectiva de comprobar el correcto funcionamiento de las unidades individuales 
 más pequeñas de los programas informáticos", 70)]
     // ReSharper restore StringLiteralTypo
-    public void CorrectTokenCount(string text, int tokenCount)
+    public void ItReturnsTheCorrectNumberOfTokens(string text, int tokenCount)
     {
+        // Act-Assert
         Assert.Equal(tokenCount, GPT3Tokenizer.Encode(text).Count);
+        Assert.Equal(tokenCount, GPT3Tokenizer.Encode(new StringBuilder(text)).Count);
+        Assert.Equal(tokenCount, GPT3Tokenizer.Encode(text.ToArray()).Count);
+        Assert.Equal(tokenCount, GPT3Tokenizer.Encode(text.ToCharArray()).Count);
+        Assert.Equal(tokenCount, GPT3Tokenizer.Encode(text.ToCharArray().ToList()).Count);
     }
 
     // TODO: check actual token IDs// ReSharper disable StringLiteralTypo
@@ -51,11 +58,15 @@ public void CorrectTokenCount(string text, int tokenCount)
     [InlineData("Sequences of characters commonly found next to each other may be grouped together: 1234567890", "[44015,3007,286,3435,8811,1043,1306,284,1123,584,743,307,32824,1978,25,17031,2231,30924,3829]")]
     [InlineData("ἀμφὶ Ποσειδάωτα, μέγαν θεόν, ἄρχομ᾽ ἀείδειν,", "[157,120,222,34703,139,228,45495,114,7377,254,26517,38392,30950,29945,138,112,138,105,49535,32830,17394,11,18919,138,255,42063,17394,26180,7377,116,30950,139,234,26180,11,28053,120,226,33643,139,229,26517,34703,157,122,121,28053,120,222,30950,138,107,138,112,30950,29945,26180,11]")]
     // ReSharper restore StringLiteralTypo
-    public void TokenIdsMatch(string text, string tokens)
+    public void ItReturnsTheCorrectTokens(string text, string tokens)
     {
+        // Arrange
         List<int> expectedTokens = JsonSerializer.Deserialize<List<int>>(tokens)!;
+
+        // Act
         List<int> actualTokens = GPT3Tokenizer.Encode(text);
 
+        // Assert
         Assert.Equal(expectedTokens.Count, actualTokens.Count);
         Assert.Equal(tokens.Replace(" ", ""), JsonSerializer.Serialize(actualTokens).Replace(" ", ""));
     }