T removeFront() //removeFront
    {
        if (head == NULL)
        {
            return NULL;
        }
        else if (head->next == NULL)
        {
            T output;
            output = head->data;
            delete head;
            return output;
        }
        else
        {
            T output;
            temp = head;
            output = head->data;
            head = head->next;
            delete temp;
            head -> prev = NULL;
            return output;
        }
    }