557. Reverse Words in a String III

class Solution {
public:
    string reverseWords(string s) {
        string temp;
		string ret;
		for (int i = 0; i < s.length(); i++) {
			if (s.at(i) == ' ')
			{
				reverse(temp.begin(), temp.end());
				ret += temp + " ";
				temp.clear();
				continue;
			}
			temp += s.at(i);
		}
		if (s.length() > 0)
		{   
		    reverse(temp.begin(), temp.end());
			ret += temp;
		}
		return ret;
    }
};