Refactored ReverseStringUsingStack utility for reversing strings using stack

Author: navaneedan07

src/main/java/com/thealgorithms/strings/ReverseString.java

@@ -76,14 +76,13 @@ public static String reverse4(String str) {
             return str;
         }
         // Push each character of the string onto the stack
-        for (char i : str.toCharArray()) {
-            stack.push(i);
+        for (char ch : str.toCharArray()) {
+            stack.push(ch);
         }
         // Pop each character from the stack and append to the StringBuilder
         while (!stack.isEmpty()) {
             reversedString.append(stack.pop());
         }
         return reversedString.toString();
     }
-
 }