Function concat_if_not_empty

RecompModTool/main.cpp:56–64

};

static std::filesystem::path concat_if_not_empty(const std::filesystem::path& parent, const std::filesystem::path& child) {
    if (child.is_absolute()) {
        return child;
    }
    if (!child.empty()) {
        return parent / child;
    }
    return child;
}

static bool validate_version_string(std::string_view str, bool& has_label) {
    std::array<size_t, 2> period_indices;