为什么这个程序运行不了，调试的时候又报错？

Question

想创建一个链式结构的队列，输入队列中每个人的程序并输出，但是为什么运行不了，调试的时候又报错？希望得到解答。
Thread 1 received signal SIGSEGV,Segmentation fault.

#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#define N 40
typedef struct queue
{
    char elemdata[N];
    struct queue *next;
}Queueprt;

typedef struct link
{
    Queueprt *front;
    Queueprt *rear;
}Linkqueue;

void Createqueue(Linkqueue *Q);
void Insertqueue(Linkqueue *Q, char *data);
void Dequeue(Linkqueue *Q, char *str);

int main(void)
{
    char name[N][N];
    char str[N];
    int n;
    Linkqueue *people = NULL;
    Createqueue(people);
    printf("How many people?\n");
    scanf("%d", &n);
    for(int i = 0; i < n; i++)
    {
        scanf("%s", name[i]);
        Insertqueue(people, name[i]);
    }
    for(int i = 0; i < n; i++)
    {
        Dequeue(people, str);
        printf("%s\n", str);
    }
    return 0;
}


void Createqueue(Linkqueue *Q)
{
    Q->front = NULL;
    Q->rear  = NULL;
    Q->front = Q->rear = (Queueprt*)malloc(sizeof(Queueprt));
    if(Q->front == NULL)
    {
        printf("No enough memory!\n");
        exit(0);
    }
    Q->front->next = NULL;
}

void Insertqueue(Linkqueue *Q, char *data)
{
    Queueprt *p;
    p = (Queueprt *) malloc(sizeof(Queueprt));
    if(p == NULL)
    {
        printf("No enough memory to insert!\n");
        exit(0);
    }
    strcpy(p->elemdata, data);
    Q->rear->next = p;
    Q->rear = p;
    p->next = NULL;
}

void Dequeue(Linkqueue *Q, char *str)
{
    Queueprt *p;
    if(Q->front == Q->rear)
    {
        return;
    }
    p = Q->front->next;
    strcpy(str, p->elemdata);
    Q->front->next = p->next;

    if(Q->rear == p)
    {
        Q->rear = Q->front;
    }
    free(p);
}

Answer 1

Createqueue(people);调用前，people是空的，这个函数内部，你又直接进行Q的操作了，没有给这个链表头分配空间啊
改为：
Linkqueue * people = (Queueprt * )malloc(sizeof(Queueprt));
Createqueue(people);