public void makeUnique() {
        if (head != null && head.getNext() != null) {
            Node pointer = head;
            Node pre, now;

            while (pointer != null) {
                pre = pointer;
                now = pointer.getNext();
                while (now != null) {
                    if (now.getValue() == pointer.getValue()) {
                        now = now.getNext();
                        pre.setNext(now);
                    } else {
                        now = now.getNext();
                        pre = pre.getNext();
                    }
                }
                tail = now; // Ikke testet
                pointer = pointer.getNext();
            }
        }
    }