C语言链表插入问题 插入节点到头节点之前去 遍历后发现只能显示插入的那个节点。

#include
#include
#include
#include
struct student{
char name[10];
struct student next;
};
struct student *charu(struct student *p)
{
struct student *current;
struct student *insert;
int a;
insert=(struct student)malloc(sizeof(struct student));
char name[10];
printf("请输入你要插入的位置:");
scanf("%d",&a);
printf("请输入要插入的字符:\n");
scanf("%s",name);
getchar();
strcpy(insert->name,name);
current=p;
if(a>0)
{}
else if(a==0)
{insert->next=current;
p=insert;
}
return p;
}
void main()
{
struct student head,*non,*end;
char str[10],i,j;
int a;
head=(struct student)malloc(sizeof(struct student));
printf("请输入名字:\n");
scanf("%s",str);
getchar();
strcpy(head->name,str);
printf("是否要继续输入:");
scanf("%c",&i);
non=head;
while(i!='n')
{
end=(struct student*)malloc(sizeof(struct student));
printf("请输入名字:\n");
scanf("%s",str);
getchar();
strcpy(end->name,str);
non->next=end;
non=end;
printf("是否要继续输入:");
scanf("%c",&i);
}
non->next=NULL;
while(head!=NULL)
{printf("%s\n",head->name);head=head->next;}
getchar();
printf("你是否要插入字符:");
scanf("%c",&j);
if(j=='y')
{
head=charu(head);
printf("插入后的链表为:\n");
while(head!=NULL)
{printf("%s\n",head->name);head=head->next;}
}
}
我插入一个节点第0个位置 就是头结点那个位置 插入完了以后遍历只能显示出第一个节点 这是怎么回事啊请教各位！！

struct student *charu(struct student *p) 该处，需要传输的是指针的指针。 具体还需要再调试一下啊。仅传入指针，返回后就不对了。

struct student *charu(struct student **p)
{
struct student *current;
struct student *insert;
int a;
insert=(struct student)malloc(sizeof(struct student));
char name[10];
printf("请输入你要插入的位置:");
scanf("%d",&a);
printf("请输入要插入的字符:\n");
scanf("%s",name);
getchar();
strcpy(insert->name,name);
current=*p;
if(a>0)
{}
else if(a==0)
{insert->next=current;
*p=insert;
}
return p;
}

struct student{
char name[10];
struct student next;
};
应该这样写==》
typedef struct student{
char name[10];
student* next;
} student;