TODO 현재 디렉토리 내의 내용 정리 references 읽어 보기 Reference http://en.cppreference.com/w/cpp/locale/codecvt https://github.com/nemtrif/utfcpp?tab=readme-ov-file#utf8-cpp-utf-8-with-c-in-a-portable-way https://thephd.dev/the-c-c++-rust-string-text-encoding-api-landscape codecvt가 c++26에서 삭제