删除子串

/*判断第二个字符串是否为第一字符串的子串，如果是，则将该子串删除
比如 bissrc ＝ a123afed
littlesrc = afe；
返回a123d；
*/
#include <stdio.h>
#include <string.h>
#include <stdlib.h>
//判断一个字符串是否为另一个的子串，如果是，返回该子串首字母所在的位置
//如果不是，返回－1。
int findsubstring(char bigsrc[],  const char littlesrc[])
{
char *flagbig = bigsrc;
char *flaglittle =littlesrc;
char *pbig,*plittle;
pbig = bigsrc;
plittle = littlesrc;

for (pbig = bigsrc; *pbig != '/0'; pbig++)
{
if (*pbig == *plittle)
{
flagbig = pbig;
flaglittle = plittle;
plittle++;
flagbig++;
if (*plittle == '/0')
return  (flagbig - (plittle - littlesrc) - bigsrc);
}
else
plittle = littlesrc;
if ((flagbig != bigsrc) && (*(pbig + 1) != *(flaglittle + 1)))
{
pbig = pbig - (flaglittle - littlesrc);
flagbig = bigsrc;
flaglittle = plittle;
plittle = littlesrc;
}
}
return -1;
}
//字符删除，将src中第loc个字符删除
int leespy(char src[],int loc)
{
int len = strlen(src);
for (loc; loc < len; loc++)
*(src + loc) = *(src + loc + 1);
src[len] = '/0';
}
//删除子串
int del_substr(char str[], const char  substr[])
{
int ret;
int sublen = strlen(substr);
int tmp;
if (substr == NULL)
{
return 1;
}
ret = findsubstring(str, substr);
tmp = ret;
if (ret > 0)
{
for (ret; ret < tmp + sublen; ret++)  //由于每次只能删除1个，所以用循环删除
leespy(str,tmp);
return 1;
}
else
return 0;
}
int main (int argc, char *argv[])
{
char src[] = "a123afed";
char little[] = "afe";
del_substr(src,little);
printf("%s/n",src);
return(0);
}