对句子按单词逆序

输入一个英文句子，对句子中的单词逆序。其中"-"作为单词连接符，"--"作为单词分隔符
比如，I am a student, 逆序之后为student a am I。

#include <stdio.h>
#include <stdlib.h>

int reverse(char* strOut, const char* strIn)
{
    if (NULL == strOut || NULL == strIn)
    {
        return -1;
    }

    const char* pTraIn = strIn;
    char strTmp[40] = {'\0'};
    char* pTmp = strTmp;

    while (*pTraIn != '\0')
    {
        pTraIn++;
    }
    pTraIn--;

    while (pTraIn != strIn - 1)
    {
        if ((*pTraIn >= 'a' && *pTraIn <= 'z') ||
            (*pTraIn >= 'A' && *pTraIn <= 'Z') ||
            (*pTraIn == '-' && ((*(pTraIn+1) >= 'a' && *(pTraIn+1) <= 'z') ||
                                (*(pTraIn+1) >= 'A' && *(pTraIn+1) <= 'Z')
                             )
                             && ((*(pTraIn-1) >= 'a' && *(pTraIn-1) <= 'z') ||
                                (*(pTraIn-1) >= 'A' && *(pTraIn-1) <= 'Z')
                             )
            ) ||
            ('\'' == *pTraIn)
         )
        {
            *pTmp++ = *pTraIn--;
        }
        else
        {
            if (pTmp != strTmp)
            {
                pTmp--;
                while (pTmp != strTmp)
                {
                    *strOut++ = *pTmp--;
                }
                *strOut++ = *pTmp;
                *strOut++ = ' ';
            }
            pTraIn--;
        }
    }
    if (pTmp != strTmp)
    {
        pTmp--;
        while (pTmp != strTmp)
        {
            *strOut++ = *pTmp--;
        }
        *strOut++ = *pTmp;
    }
    *strOut = '\0';

    return 0;
}

int main()
{
    char str1[] = "I am a student";
    char str2[] = "he-llo, may--be I'm . a student";
    char str3[] = ". hello, i am a  student.. *";
    char strRet[200];

    reverse(strRet, str1);
    puts(strRet);
    reverse(strRet, str2);
    puts(strRet);
    reverse(strRet, str3);
    puts(strRet);

    return 0;
}