链表想让指针指向最后一个 但是通过不了

void InsertLinkList(LinkList *hand)
{
    LinkList *p,s;
    int flag=1;
    p=hand;
    s=(LinkList)malloc(sizeof(LinkList));
    while(flag)
    {
        while(p->next!=NULL)
        {
            p++;
        }
            prinft("please enter student xinxi");
            scanf("%s%s%d%s%s",s->date.xuehao,s->date.name,&s->date.sex,s->date.tel,s->date.qq);
            s->next=p->next;
            p->date=s;
            printf("if or not erter again(1/0)");
            scanf("%d",&falg);
        
    }
    return;
}