下面这段代码有问题，但是我不知道怎么改？求大佬解答一下，谢谢！

struct node
{
int data;
struct node *next;
}
//swap between second and third
void swap(node *first, node *second, node *third)
{
third->next = second;
first->next = third;
second->next = third->next;
}

void swap(node* first, node* second, node* third)
{
    int temp = second->data;
    second->data = third->data;
    third->data = temp;

    first->next = third;
    second->next = third->next;
    third->next = second;
}

first->next = third;

second->next = third->next;

third->next = second;

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由于不确定这些节点在整个链表中的关系，也不知道first是不是就是链表头，所以不能冒然该指针。只能交换数据。

struct node
{
    int data;
    struct node *next;
}
//swap between second and third
void swap(node *first, node *second, node *third)
{
    int temp = second->data;
    second->data = third->data;
    third->data = temp;
}

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如果肯定者3个节点是顺序关系，就可以交换指针

void swap(node* first, node* second, node* third)
{
    if（first != NULL && second != NULL && third != null &&
        first->next = second && second->next == third)
    {
        first->next = third;
        second->next = third->next;
        third->next = second;
    }
}

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