public static String superReducedString(String s) {
        String result = "";
        Stack<Character> stack = new Stack<>();
        int n = s.length();
        for(int i = 0; i < n; i++){
            char c = s.charAt(i);
            if(stack.empty() || c != stack.peek())
                stack.push(c);
            else
                stack.pop();
            }
        if(stack.empty())
            result = "Empty String";
        
        else
          for(char c: stack)
              result += c;
        
        return result;        
        }