[求助]关于链表的问题，谢谢（跪求多时无人了）

#include <stdio.h>
#include <malloc.h>
#include "pub.h"

int main()
{
struct student *head1,*head2;

head1 = creat();
head2 = creat();

destroy(head1);
destroy(head2);

getchar();

return 1;
}

#include <stdio.h>
#include <malloc.h>
#include "pub.h"

struct student *creat()
{
struct student head;
struct student *p;
int num;
float scroe;

head.next = NULL;
scanf("%d,%f",&num,&scroe);
while(num != 0)
{
p = (struct student *)malloc(LEN);
if(p == NULL)
{
printf("memory is not enough!\n");
break;
}

p->num = num;
p->scroe = scroe;

p->next = head.next;
head.next = p;

scanf("%d,%f",&num,&scroe);
}

if(p == NULL)
{
destroy(head.next);

return NULL;
}

return head.next;
}

int destroy(struct student *head)
{
struct student *p = head;
struct student *pNext = NULL;

while(p != NULL)
{
pNext = p->next;
free(p);
p = pNext;
}

return 1;
}

#ifndef _STULIST_H
#define _STULIST_H

struct student
{
int num;
float scroe;
struct student *next;
};

struct student *creat();
int destroy(struct student *head);

#define LEN sizeof(struct student)

#endif