【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.

#include <stdio.h>
int judge_char(char ch)
{
    int result;
    switch(ch)
    {
    case '	':result = 0;break;
    case '
':result = 0;break;
    case '
':result = 0;break;
    case ' ':result = 0;break;
    default:result = 1;
    }
    return result;
}

char *shrink_space(char *dest, const char *src, int n)
{
    int i = 0;
    char *tmp = dest;
    while(i < n && *src != '')
    {
        if(judge_char(*src))
            *tmp++ = *src++;
        else
        {
            if(!judge_char(*(src - 1)))
                src++;
            else
            {
                *tmp++ = ' ';
                src++;
            }
        }
        i++;
    }
    *tmp = '';
    return dest;
}

int main(void)
{
    char a[100];
    char b[50] = "This 
        Content         hoho       is ok";
    printf("%s
",shrink_space(a,b,50));
}