diff --git a/DIRECTORY.md b/DIRECTORY.md
index a7e5fe2c6..aea7b1548 100644
--- a/DIRECTORY.md
+++ b/DIRECTORY.md
@@ -9,6 +9,7 @@
   * [SumOfSubset](Backtracking/SumOfSubset.js)
 * **Bit-Manipulation**
   * [BinaryCountSetBits](Bit-Manipulation/BinaryCountSetBits.js)
+  * [GrayCodes](Bit-Manipulation/GrayCodes.js)
   * [IsPowerofFour](Bit-Manipulation/IsPowerofFour.js)
   * [IsPowerOfTwo](Bit-Manipulation/IsPowerOfTwo.js)
   * [LogTwo](Bit-Manipulation/LogTwo.js)
@@ -55,6 +56,7 @@
   * [OctToDecimal](Conversions/OctToDecimal.js)
   * [OuncesToKilograms](Conversions/OuncesToKilograms.js)
   * [RailwayTimeConversion](Conversions/RailwayTimeConversion.js)
+  * [RgbHslConversion](Conversions/RgbHslConversion.js)
   * [RgbHsvConversion](Conversions/RgbHsvConversion.js)
   * [RGBToHex](Conversions/RGBToHex.js)
   * [RomanToDecimal](Conversions/RomanToDecimal.js)
@@ -72,14 +74,14 @@
     * [Graph2](Data-Structures/Graph/Graph2.js)
     * [Graph3](Data-Structures/Graph/Graph3.js)
   * **Heap**
+    * [BinaryHeap](Data-Structures/Heap/BinaryHeap.js)
     * [KeyPriorityQueue](Data-Structures/Heap/KeyPriorityQueue.js)
-    * [MaxHeap](Data-Structures/Heap/MaxHeap.js)
-    * [MinHeap](Data-Structures/Heap/MinHeap.js)
     * [MinPriorityQueue](Data-Structures/Heap/MinPriorityQueue.js)
   * **Linked-List**
     * [AddTwoNumbers](Data-Structures/Linked-List/AddTwoNumbers.js)
     * [CycleDetection](Data-Structures/Linked-List/CycleDetection.js)
     * [DoublyLinkedList](Data-Structures/Linked-List/DoublyLinkedList.js)
+    * [MergeTwoSortedLinkedLists](Data-Structures/Linked-List/MergeTwoSortedLinkedLists.js)
     * [ReverseSinglyLinkedList](Data-Structures/Linked-List/ReverseSinglyLinkedList.js)
     * [SinglyCircularLinkedList](Data-Structures/Linked-List/SinglyCircularLinkedList.js)
     * [SinglyLinkedList](Data-Structures/Linked-List/SinglyLinkedList.js)
@@ -88,6 +90,7 @@
     * [Queue](Data-Structures/Queue/Queue.js)
     * [QueueUsing2Stacks](Data-Structures/Queue/QueueUsing2Stacks.js)
   * **Stack**
+    * [EvaluateExpression](Data-Structures/Stack/EvaluateExpression.js)
     * [Stack](Data-Structures/Stack/Stack.js)
     * [StackES6](Data-Structures/Stack/StackES6.js)
   * **Tree**
@@ -179,6 +182,7 @@
   * [DecimalExpansion](Maths/DecimalExpansion.js)
   * [DecimalIsolate](Maths/DecimalIsolate.js)
   * [DegreeToRadian](Maths/DegreeToRadian.js)
+  * [Determinant](Maths/Determinant.js)
   * [EuclideanDistance](Maths/EuclideanDistance.js)
   * [EulerMethod](Maths/EulerMethod.js)
   * [EulersTotient](Maths/EulersTotient.js)
@@ -239,6 +243,7 @@
   * [RadianToDegree](Maths/RadianToDegree.js)
   * [ReverseNumber](Maths/ReverseNumber.js)
   * [ReversePolishNotation](Maths/ReversePolishNotation.js)
+  * [RowEchelon](Maths/RowEchelon.js)
   * [ShorsAlgorithm](Maths/ShorsAlgorithm.js)
   * [SieveOfEratosthenes](Maths/SieveOfEratosthenes.js)
   * [SieveOfEratosthenesIntArray](Maths/SieveOfEratosthenesIntArray.js)
diff --git a/Data-Structures/Heap/test/BinaryHeap.test.js b/Data-Structures/Heap/test/BinaryHeap.test.js
index 56aef11e0..aef538d9f 100644
--- a/Data-Structures/Heap/test/BinaryHeap.test.js
+++ b/Data-Structures/Heap/test/BinaryHeap.test.js
@@ -36,7 +36,7 @@ describe('BinaryHeap', () => {
     it('should handle insertion of duplicate values', () => {
       // Check if the heap handles duplicate values correctly
       minHeap.insert(2)
-      console.log(minHeap.heap);
+      console.log(minHeap.heap)
       expect(minHeap.heap).toEqual([1, 3, 2, 4, 8, 6, 2])
     })
 
diff --git a/Data-Structures/Stack/EvaluateExpression.js b/Data-Structures/Stack/EvaluateExpression.js
index e59a4a37c..f8e976e16 100644
--- a/Data-Structures/Stack/EvaluateExpression.js
+++ b/Data-Structures/Stack/EvaluateExpression.js
@@ -6,53 +6,53 @@
  * @returns {number|null} - Result of the expression evaluation, or null if the expression is invalid.
  */
 function evaluatePostfixExpression(expression) {
-  const stack = [];
+  const stack = []
 
   // Helper function to perform an operation and push the result to the stack. Returns success.
   function performOperation(operator) {
-    const rightOp = stack.pop(); // Right operand is the top of the stack
-    const leftOp = stack.pop(); // Left operand is the next item on the stack
+    const rightOp = stack.pop() // Right operand is the top of the stack
+    const leftOp = stack.pop() // Left operand is the next item on the stack
 
     if (leftOp === undefined || rightOp === undefined) {
-      return false; // Invalid expression
+      return false // Invalid expression
     }
     switch (operator) {
       case '+':
-        stack.push(leftOp + rightOp);
-        break;
+        stack.push(leftOp + rightOp)
+        break
       case '-':
-        stack.push(leftOp - rightOp);
-        break;
+        stack.push(leftOp - rightOp)
+        break
       case '*':
-        stack.push(leftOp * rightOp);
-        break;
+        stack.push(leftOp * rightOp)
+        break
       case '/':
         if (rightOp === 0) {
-          return false;
+          return false
         }
-        stack.push(leftOp / rightOp);
-        break;
+        stack.push(leftOp / rightOp)
+        break
       default:
-        return false; // Unknown operator
+        return false // Unknown operator
     }
-    return true;
+    return true
   }
 
-  const tokens = expression.split(/\s+/);
+  const tokens = expression.split(/\s+/)
 
   for (const token of tokens) {
     if (!isNaN(parseFloat(token))) {
       // If the token is a number, push it to the stack
-      stack.push(parseFloat(token));
+      stack.push(parseFloat(token))
     } else {
       // If the token is an operator, perform the operation
       if (!performOperation(token)) {
-        return null; // Invalid expression
+        return null // Invalid expression
       }
     }
   }
 
-  return (stack.length === 1) ? stack[0] : null;
+  return stack.length === 1 ? stack[0] : null
 }
 
-export { evaluatePostfixExpression };
+export { evaluatePostfixExpression }
diff --git a/Data-Structures/Stack/test/EvaluateExpression.test.js b/Data-Structures/Stack/test/EvaluateExpression.test.js
index eea764cac..69a2e1636 100644
--- a/Data-Structures/Stack/test/EvaluateExpression.test.js
+++ b/Data-Structures/Stack/test/EvaluateExpression.test.js
@@ -1,22 +1,21 @@
-import { evaluatePostfixExpression } from '../EvaluateExpression.js';
+import { evaluatePostfixExpression } from '../EvaluateExpression.js'
 
 describe('evaluatePostfixExpression', () => {
   it('should evaluate a valid expression', () => {
-    const expression = '3 4 * 2 / 5 +'; // (3 * 4) / 2 + 5 = 11
-    const result = evaluatePostfixExpression(expression);
-    expect(result).toBe(11);
-  });
+    const expression = '3 4 * 2 / 5 +' // (3 * 4) / 2 + 5 = 11
+    const result = evaluatePostfixExpression(expression)
+    expect(result).toBe(11)
+  })
 
   it('should handle division by zero', () => {
-    const expression = '3 0 /'; // Division by zero
-    const result = evaluatePostfixExpression(expression);
-    expect(result).toBe(null);
-  });
+    const expression = '3 0 /' // Division by zero
+    const result = evaluatePostfixExpression(expression)
+    expect(result).toBe(null)
+  })
 
   it('should handle an invalid expression', () => {
-    const expression = '3 * 4 2 / +'; // Invalid expression
-    const result = evaluatePostfixExpression(expression);
-    expect(result).toBe(null);
-  });
-
-});
+    const expression = '3 * 4 2 / +' // Invalid expression
+    const result = evaluatePostfixExpression(expression)
+    expect(result).toBe(null)
+  })
+})
diff --git a/Maths/test/Determinant.test.js b/Maths/test/Determinant.test.js
index df9d34df8..f6cba8241 100644
--- a/Maths/test/Determinant.test.js
+++ b/Maths/test/Determinant.test.js
@@ -54,10 +54,7 @@ describe('Determinant', () => {
       'Square matrix is required.'
     ],
     [[1, 3, 2, [5, 8, 6], 3], 'Input is not a valid 2D matrix.']
-  ])(
-    'Should return the error message.',
-    (matrix, expected) => {
-      expect(() => determinant(matrix)).toThrowError(expected)
-    }
-  )
+  ])('Should return the error message.', (matrix, expected) => {
+    expect(() => determinant(matrix)).toThrowError(expected)
+  })
 })