void list_copy(Student<Item>& source_ptr,Student<Item>& head_ptr, Student<Item>*& tail_ptr) 
{
	head_ptr = NULL;
	tail_ptr = NULL;

	// Handle the case of the empty list
	if (source_ptr == NULL)
	    return;	

	// Make the head node for the newly created list, and put data in it
	list_head_insert(head_ptr, source_ptr->data( ));
	tail_ptr = head_ptr.get(); 
	
	// Copy rest of the nodes one at a time, adding at the tail of new list
	source_ptr = source_ptr->link( ); 
        while (source_ptr != NULL)
	{
	    list_insert(tail_ptr, source_ptr->data( ));
	    tail_ptr = tail_ptr->link( );
	    source_ptr = source_ptr->link( );
	}
}