Function split_string

src/string_util.cpp:360–365

	}

	std::pair<string_view, string_view> split_string(string_view last, char const sep)
	{
		auto const pos = last.find(sep);
		if (pos == string_view::npos) return {last, {}};
		else return {last.substr(0, pos), last.substr(pos + 1)};
	}

	std::pair<string_view, string_view> split_string_quotes(string_view last, char const sep)
	{