/**
         * Adds elements at the end of the list
         *
         * @param value to be added
         */
        public void addItem(int value) {

            Node newNode = new Node(value);


            if (head != null) { //if head is not null, then the list is not empty

                Node current = head;

                while (current.next != null) { //iterate till the last element
                    current = current.next;
                }

                current.next = newNode; //append at the last

            } else { //head is null, so the list is empty

                head = newNode;

            }

            System.out.println("Added value: " + value);
            print();
        }