Function ends_with

tests/test_phase4.cpp:26–29

};

static bool ends_with(const std::string & s, const std::string & suffix) {
    return s.size() >= suffix.size() &&
           s.compare(s.size() - suffix.size(), suffix.size(), suffix) == 0;
}

static std::vector<prompt_case> load_prompt_cases(const std::string & path) {
    std::vector<prompt_case> cases;