Simple Pig Latin

• Time : $O(n)$
• Space : $O(n)$

using namespace std;
std::string pig_it(std::string str) {
    string now = "", res = "";
    auto work = [&]() {
      if(now.length()) {
        if(now.length() > 1) res += now.substr(1);
        res.push_back(now[0]);
        res += "ay";
        now = "";
      }
    };
    for(auto& ch : str) {
        if(isalpha(ch)) now.push_back(ch);
        else {
            work();
            res.push_back(ch);
        }
    }
    work();
    return res;
}