C++ String Compare

What the flying fuck is wrong with my C++ string compare?


//Stem word
string stemWord(string word)
{
    const int word_len = word.length();
    string stems[4] = {"ing","ed","er","s"};
    string temp = "";
    bool isStem;

    if (word_len > 4)
    {
        for (int i = 0; i < 4 || isStem == false; i++)
        {
            if (word.compare(word_len - stems[i].length(), stems[i].length(), stems[i]) == 0)
            {
                for (int x = 0; x < diff; x++)
                {
                    temp[x] += word[x];
                }

                word = temp;
            }      
        }
    }

    return word;
}

The word I'm sending to the is "testing," and this method is supposed to remove the stem (eg. "ing") and return the resulting stemmed word.

According to the MSDN's shitty "still, blahblah.." example (http://www.cplusplus.com/reference/string/string/compare/) this should work perfectly fine.

>>26
The funny thing is, the C++ code compiles into something that calls strlen() and something named ?compare@?$basic_string@DU?$char_traits@D@std@@V?$allocator@D@2@@std@@QBEHIIABV12@II@Z in the lib that eventually calls memcmp().