https://developer.apple.com/documentation/foundation/measurement단위를 변환해 주는 메서드를 제공 (convert(), converted() 등) https://developer.apple.com/do
참고 문서https://beepeach.tistory.com/194https://daheenallwhite.github.io/swift/2019/05/01/check-input-using-CharacterSet/유니코드 - Table 12. Gener