合并两个循环单链表出错

#include <stdio.h>
#include <stdlib.h>

typedef int Elemtype;
typedef struct C
{
    Elemtype data;
    struct C *next;
} CNode, *CLink;
CLink Connect(CLink a, CLink b)
{
    CLink p = a->next;
    a->next = b->next->next;
    free(b->next);                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                  
    b->next = p;
    return b;
}

void Display(CLink L)
{
    CLink p = L->next;
    while (p != L)
    {
        printf("%d ", p->data);
        p = p->next;
    }
    printf("\n");
}

CLink RCreate(int n)
{
    CLink L = (CLink)malloc(sizeof(CNode));
    // L->data = 0;
    L->next = NULL;
    CLink r = L; //创建尾结点
    for (int i = 0; i < n; i++)
    {
        CLink p = (CLink)malloc(sizeof(CNode));
        scanf("%d", &p->data);
        //p->next = NULL;
        r->next = p; //将新结点链接到表尾
        r = p;       //循环过程中r始终指向链表的尾结点
    }
    r->next = L;
    return L;
}

int main()
{
    CLink a = RCreate(4);
    Display(a);
    Display(a);
    CLink b = RCreate(3);
    Display(b);
    CLink c = Connect(a, b);
    Display(c);
    Display(b);

    return 0;
}

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能说一下你的编程思想吗？或者说出的错，我才好改，毕竟光看代码不好理解你出现的错误