Method enqueue

src/test/resources/pta/taint/LinkedQueue.java:31–41

(String item)

    }

    public void enqueue(String item) {
        Node oldlast = last;
        last = new Node();
        last.item = item;
        last.next = null;
        if (isEmpty())
            first = last;
        else
            oldlast.next = last;
        n++;
    }

    public String dequeue() {
        if (isEmpty())