void pushQueue(Queue *q, int vertices)
{
      if (q->head == NULL)
      {
            q->head->value = vertices;
            return;
      }
      vertices = q->head->value;
      while (q->head->next != NULL)
      {
            q->head = q->head->next;
      }
      q->head->next->value = vertices;
      return;
}