单词翻转

#include <bits/stdc++.h>

using namespace std;

void swap_str(char* a, char* b)
{
    char t = *a;
    *a = *b;
    *b = t;
}

void str_reverse(char *start, char *over)
{
    while (start < over)
    {
        swap_str(start++, over--);
    }
}

void reverseString(char *s)
{
    char *start = s;
    char *over  = start;

    for ( ; *over!= ‘\0‘; over++ )
    {
    };
    over--;

    str_reverse( start, over );
    start = s;
    over  = start;
    char* end_word = NULL;

    while ( *(over-1) != ‘\0‘ )
    {
        if (*over == ‘ ‘|| *over == ‘\0‘)
        {
            end_word = over-1;
            str_reverse(start, end_word);
            start = over;
            while(*start == ‘ ‘)
            {
                start++;
            }
        }
        over++;
    }
}

int main()
{
    char str[] = "I am  a    student.";
    reverseString(str);
    printf("%s\n", str);
}