下面是我写的一个程序求助大侠帮忙看看
我的目的是要把一段内容中的to删除但是如果遇到先together，too着样的内容就把他们中的第一个0也给删除了请问给如何做，帮忙修改一下，或指点一下小弟，小弟在此先谢过各位大侠。。。。！！！！
#include"stdio.h"
#define n 100
void del_char(char str1[n],char str2[])
{
  char str[n],*p1,*q,i,j;
  p1=str1;
  q=str;
  *q=*p1;
  i=0;
  while(*p1!='\0')

       {
          {
             if(*p1==str2[i])
                 {
                    p1++;
                    i++;
                    if(*p1==str2[i])
                    {
                       p1++;
                       i++;
                       if(*p1==str2[i])
                       {
                       p1++;
                       i++;
                        }
                       else
                       {
                       q++;
                       }
                      }
                    else
                    {
                     q++;
                     }
                 }
                 else
                    {
                    p1++;
                    q++;

                    }
        *q=*p1;
          }
        i=0;
      }
        printf("%s\n",str);
}
 main()
{
char str1[n],str2[]={"to "};
 
printf("please enter a text and includ 'to':\n");
 gets(str1);
 printf("remove 'to',remaining :\n");
 del_char(str1,str2);
 getch();}