[Programmers] JadenCase 문자열 만들기

string solution(string s) {
    s.at(0) = toupper(s.at(0));
    for (int i = 1; i < s.length(); i++)
        s.at(i) = (s.at(i - 1) == ' ') ? toupper(s.at(i)) : tolower(s.at(i));
    return s;
}

string solution(string S) {
    string answer = "";
    
    istringstream iss(S);

    vector<string> v;
    for(string s; iss >> s; ){
        answer += toupper(s[0]);
        for(int i=1; i<s.length(); i++){
            answer += tolower(s[i]);
        }
        answer += " ";
    }
    answer = answer.substr(0,answer.length()-1);

    return answer;
}