auto split = [](string&& a) -> container {
    auto result  = container{};
    string::size_type found, current = 0;
    while ((found = a.find(",", current)) != string::npos) {
        result.emplace_back(a, current, found - current);
        current = found + 1;
    }
    result.emplace_back(a, current, a.size() - current);
    return result;
};