删除指定长度的字符

#include <stdio.h>
#include <string.h>

char *deleteChars(char *str,int pos,int len)
{
char *p = str+pos-1;
int tt = strlen(str);
if((pos<1)||(p-str)>>tt)
{
return str;
}
if((p+len-str)>tt)
{
*p = '\0';
return str;
}
while(*p&&*(p+len))
{
*p = *(p+len);
p++;
}
*p = '\0';
return str;
}
int main()
{
char string[] ="abcdefg";
int pos = 0;
int len = 0;
int steps = 0;
printf("%s\n",string);
scanf("%d",&pos);
scanf("%d",&len);
deleteChars(string.pos,len);
printf("%s\n",string);
return 0;
}