c创建链表与删除

#include<stdio.h>
#include<stdint.h>
#include <cstdlib>
/*定义链表结构体*/
struct ListNode
{
    int val;
    struct ListNode* next
};
void ListNode_insert(struct ListNode* head,int val)
{
	//在指定位置插入ListNode
    struct ListNode* new_ListNode = (struct ListNode*)(malloc(sizeof(struct ListNode)));
     new_ListNode->val = val;
    head->next = new_ListNode;
}
int main(void)
{
    struct ListNode* head = (struct ListNode*)(malloc(sizeof(struct ListNode)));
    head->val = -1;
    head->next=NULL;
    ListNode_insert(head,2);
    while(head)
    {
        free(head);
        head=head->next;
	}
}