做了一个把名字首字母小写改大写的单链表的题，有个错误一直找不出来，求大神指点
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#define FD 'a'
#define IT ' '
typedef struct aaa
{
char ch;
struct aaa *next;
} AAA;
AAA *e_linkst()
{AAA *h;
h=(AAA *)malloc(sizeof(AAA));
h->next=NULL;
return h;
}
void creat_linkst(AAA * k)
{
...