public static void clone(Stack<Integer> original, Stack<Integer> empty) {
        int temp = 0;
        Stack<Integer> storage = new Stack<Integer>();
        for (int i = 0; i < original.size(); i++) {
            temp = original.pop();
            storage.push(temp);
        }
        for (int i = 0; i < storage.size(); i++) {
            temp = storage.pop();
            original.push(temp);
            empty.push(temp);
        }

    }