字符串倒序，单词正序输出

//字符串倒序输出 Iput: Love you, No reason  Output: reason No, you Love
#include <iostream>
#include <algorithm>
#include <cassert>
#include <cctype>
using namespace std;

void ReverseString(char *const str, const int len);
void ReverseAllWord(char *str);

int main()
{
    char str[] = "Love you, No reason";
    ReverseAllWord(str);
    cout << str << endl;

    return 0;
}

void ReverseString(char *const str, const int len)
{
    if(str == NULL || len < 2)
        return;
    for(int i=0; i<(len/2); i++)
    {
        swap(str[i], str[len-i-1]);
    }
}

void ReverseAllWord(char *str)
{
    assert(str != NULL);

    ReverseString(str, strlen(str));
    cout << str << endl;

    char *word_start = str;
    char *word_end = str;
    char *temp = str;

    while(*temp)
    {
        if(isalpha(*temp))
        {
            word_start = temp;
            word_end = temp;
            while(isalpha(*word_end))
                word_end++;
            int word_len = word_end - word_start;
            ReverseString(word_start, word_len);

            temp += (word_len-1);
        }

        temp++;
    }

}