@Override
	public DoublyLinkedList delete(int index) {
		Link current = first;
		int counter = 0;

		if (length() == 0 || length() < index) {
			return null;

		} else {

			while (true) {
				if (counter == index) {
					if (index == 0) {
						current.getNext().setPrev(null);
						first = current.getNext();
						break;
					} else if (index == length() - 1) {
						current.getPrev().setNext(null);
						last = current.getPrev();
						break;
					} else {
						current.getNext().setPrev(current.getPrev());
						current.getPrev().setNext(current.getNext());
						break;
					}
				} else {
					current = current.getNext();
				}
				counter++;
			}
		}
		return current;