Add ReverseStringUsingStack utility for reversing strings using stack

Author: navaneedan07

src/main/java/com/thealgorithms/stacks/ReverseStringUsingStack.java

@@ -12,21 +12,23 @@ private ReverseStringUsingStack() {
      * @return reversed string
      */
 
-     public static String reverse(String str) {
+    public static String reverse(String str) {
 
         Stack<Character> stack = new Stack<>();
         StringBuilder reversedString = new StringBuilder();
-        
-        if(str.isEmpty()) {
+
+
+        if (str.isEmpty()) {
             return str;
         }
-        for(char i : str.toCharArray()) {
+        for (char i : str.toCharArray()) {
             stack.push(i);
         }
-        while(!stack.isEmpty()) {
+        while (!stack.isEmpty()) {
             reversedString.append(stack.pop());
         }
 
         return reversedString.toString();
+
      }
 }