Method rfind

tests/framework/src/doctest.cpp:685–691

}

String::size_type String::rfind(char ch, size_type pos) const {
    const char* begin = c_str();
    const char* it = begin + std::min(pos, size() - 1);
    for (; it >= begin && *it != ch; it--);
    if (it >= begin) { return static_cast<size_type>(it - begin); }
    else { return npos; }
}

int String::compare(const char* other, bool no_case) const {
    if(no_case)