void tricmate()
{
    int count = 1;
    node * finger = head;
    node * ahead = head->next;
    while (finger != NULL)
    {
        count++;
        if (count == 3)
        {
            count = 1;
            finger->next = ahead->next;
            delete ahead;
            node * ahead = finger->next;
        }
        finger = finger->next;
        if (finger != NULL)
            ahead = finger->next;
    }
}