public static void main(String []args) {
        SLL<Integer> lista = new SLL<>();
        lista.insertLast(2);
        lista.insertLast(3);
        lista.insertLast(5);
        lista.insertLast(11);
        lista.insertLast(55);

        SLLNode<Integer> last = lista.getFirst();
        SLLNode<Integer> first = lista.getFirst();
        SLLNode<Integer> prevLast = null;
        while (last.succ != null) {
            prevLast = last;
            last = last.succ;
        }

        prevLast.succ = null;
        //System.out.println(lista.toString());
        last.succ = first.succ;
        first.succ = last;
        //System.out.println(lista.toString());
        lista.first = last;
        first.succ = null;
        prevLast.succ = first;
        System.out.println(lista.toString());
    }