static void Test_Case2()
{
CustomQueue <int> int_queue = new CustomQueue <int>();
int_queue.enqueueing(1);
int_queue.enqueueing(2);
int_queue.enqueueing(3);
int_queue.foreach_print();
int_queue.dequeueing();
int_queue.dequeueing();
int_queue.dequeueing();
int_queue.foreach_print();
int_queue.enqueueing(4);
int_queue.enqueueing(5);
int_queue.foreach_print();
}