void ins(char string[]){
char sted[20],stringed[80];
int pos,stedlength,strlength;
int i;

printf("String to insert> ");
fflush(stdin);
gets(sted);

printf("Position of insertion> ");
scanf("%d",&pos);

stedlength=strlen(sted);
strlength=strlen(string);

for(i=0;i<strlength+stedlength;i++){
	if(i>=pos&&i<stedlength+pos)
		stringed[i]=sted[i];
	
	else if(i<pos)
		stringed[i]=string[i];
	
	else if(i>=stedlength+pos)
		stringed[i]=string[i-stedlength];
		
}
stringed[i]='\0';

strlength=strlen(stringed);

for(i=0;i<strlength;i++)
	string[i]=stringed[i];

}

在上面的for_loop裏面，沒辦法順利的把字串存到stringed裏面
理想例子：string[] = "Hello! How are you!", sted[] = " Peter", pos=5
理想輸出是Hello Peter! How are you!

不知道字串跟loop要怎樣配搭，求解答
謝謝