【C】——压缩字符串

编一个函数，输入一个字符串，要求做一个新字符串，把其中所有的一个或多个连续的空白字符都压缩为一个空格。这里所说的空白包括空格、'\t'、'\n'、'\r'。例如原来的字符串是：

This Content hoho       is ok
        ok?

        file system
uttered words   ok ok      ?
end.

压缩了空白之后就是：

This Content hoho is ok ok? file system uttered words ok ok ? end.

 #include <stdio.h>
 int judge_char(char ch)
 {
     int result;
     switch(ch)
     {
     case '\t':result = ;break;
     case '\r':result = ;break;
     case '\n':result = ;break;
     case ' ':result = ;break;
     default:result = ;
     }
     return result;
 }

 char *shrink_space(char *dest, const char *src, int n)
 {
     int i = ;
     char *tmp = dest;
     while(i < n && *src != '\0')
     {
         if(judge_char(*src))
             *tmp++ = *src++;
         else
         {
             if(!judge_char(*(src - )))
                 src++;
             else
             {
                 *tmp++ = ' ';
                 src++;
             }
         }
         i++;
     }
     *tmp = '\0';
     return dest;
 }

 int main(void)
 {
     char a[];
     char b[] = "This \
         Content         hoho       is ok";
     printf("%s\n",shrink_space(a,b,));
 }