说我没有包含指针类型 s[i]那边😭

#include<stdio.h>
int main()
{
int n,k;
char delete(char,int,int);
char s[8]='ChinaABC';
printf("from k(<=8),delete n(0<n<7):");
scanf("%d%d",&n,&k);
delete(s,n,k);
}

char delete(char s,int n,int k)
{
int i;
for(i=n;i<(k+n);i++)
{
s[i]='\0';
}
printf("%s\n",s);
}

char s[8]='ChinaABC'; 字符串用" " 引号，修改为：char s[8]="ChinaABC";
char delete(char,int,int); 函数声明定义:char delete(char*,int,int); char delete(char* s,int n,int k)