Question 2

void append_node(const int &new_item)
{
    if (headM == NULL)
    {
        Node *new_node = new Node;
        new_node->item = new_item;
        new_node->next = NULL;
        headM = new_node;
        return;
    }

    Node *p;
    p->next = headM;
    Node *new_node = new Node;
    new_node->item = new_item;
    new_node->next = NULL;
    while (p->next != NULL)
        p = p->next;

    p->next = new_node;
}