Added maximum odd binary number solution.

README.md

@@ -120,6 +120,7 @@ other languages.
 - Sort the People (https://leetcode.com/problems/sort-the-people)
 - Max Repeating Substring (https://leetcode.com/problems/maximum-repeating-substring/)
 - Sort by Increasing Frequency (https://leetcode.com/problems/sort-array-by-increasing-frequency)
+- Maximum Odd Binary Number (https://leetcode.com/problems/maximum-odd-binary-number)
 
 #### Medium
 

src/leetcode/max_binary_number.rs

@@ -0,0 +1,17 @@
+pub fn maximum_odd_binary_number(s: String) -> String {
+    let one_count = s.chars().filter(|c| *c == '1').count();
+    let ones: String = "1".repeat(one_count - 1);
+    let zeroes: String = "0".repeat(s.len() - one_count);
+    format!("{ones}{zeroes}1")
+}
+
+#[cfg(test)]
+mod tests {
+    use super::maximum_odd_binary_number;
+
+    #[test]
+    fn test_maximum_odd_binary_is_produced() {
+        let actual = maximum_odd_binary_number("101101".to_string());
+        assert_eq!("111001", actual)
+    }
+}

src/leetcode/mod.rs

@@ -49,3 +49,4 @@ mod sort_people;
 mod max_repeating_substr;
 mod freq_sort;
 mod sort_jumbled_numbers;
+mod max_binary_number;