Add ReverseStringUsingStack utility for reversing strings using stack

Author: navaneedan07

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

@@ -3,24 +3,25 @@
 import java.util.Stack;
 
 public final class ReverseStringUsingStack {
-private ReverseStringUsingStack() {
-}
+    private ReverseStringUsingStack() {
+    }
 
-/**
- * @param str string to be reversed using stack
- * @return reversed string
- */
-public static String reverse(String str) {
-    Stack<Character> stack = new Stack<>();
-    StringBuilder reversedString = new StringBuilder();
+    /**
+     * @param str string to be reversed using stack
+     * @return reversed string
+     */
+    public static String reverse(String str) {
+        Stack<Character> stack = new Stack<>();
+        StringBuilder reversedString = new StringBuilder();
 
-    if (str.isEmpty()) return str;
-    for (char i : str.toCharArray()) {
-        stack.push(i);
+        if (str.isEmpty())
+            return str;
+        for (char i : str.toCharArray()) {
+            stack.push(i);
+        }
+        while (!stack.isEmpty()) {
+            reversedString.append(stack.pop());
+        }
+        return reversedString.toString();
     }
-    while (!stack.isEmpty()) {
-        reversedString.append(stack.pop());
-    }
-    return reversedString.toString();
-}
 }