Add ReverseStringUsingStack utility for reversing strings using stack

Author: navaneedan07

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

@@ -0,0 +1,32 @@
+package com.thealgorithms.stacks;
+
+import java.util.Stack;
+
+public final class 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();
+        
+        if(str.isEmpty()) {
+            return str;
+        }
+        for(char i : str.toCharArray()) {
+            stack.push(i);
+        }
+        while(!stack.isEmpty()) {
+            reversedString.append(stack.pop());
+        }
+
+        return reversedString.toString();
+     }
+}