【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、' '、' '、' '。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.

 1 #include <stdio.h>
 2 int judge_char(char ch)
 3 {
 4     int result;
 5     switch(ch)
 6     {
 7     case '	':result = 0;break;
 8     case '
':result = 0;break;
 9     case '
':result = 0;break;
10     case ' ':result = 0;break;
11     default:result = 1;
12     }
13     return result;
14 }
15 
16 char *shrink_space(char *dest, const char *src, int n)
17 {
18     int i = 0;
19     char *tmp = dest;
20     while(i < n && *src != '')
21     {
22         if(judge_char(*src))
23             *tmp++ = *src++;
24         else
25         {
26             if(!judge_char(*(src - 1)))
27                 src++;
28             else
29             {
30                 *tmp++ = ' ';
31                 src++;
32             }
33         }
34         i++;
35     }
36     *tmp = '';
37     return dest;
38 }
39 
40 int main(void)
41 {
42     char a[100];
43     char b[50] = "This 
44         Content         hoho       is ok";
45     printf("%s
",shrink_space(a,b,50));
46 }