https://refactoring.guru/ko/design-patterns/creational-patterns
https://velog.io/@dongyi/%EB%82%B4-%ED%8F%AC%ED%8A%B8%ED%8F%B4%EB%A6%AC%EC%98%A4%EA%B0%80-%EC%84%9C%EB%A5%98%ED%83%88%EB%9D%BD%EC%9D%B8-%EC%9D%B4%EC%9C%A0-%ED%94%84%EB%A1%9C%EC%A0%9D%ED%8A%B8-%EC%9D%B4%EB%A0%87%EA%B2%8C-%ED%95%B4%EB%B3%B4%EC%84%B8%EC%9A%94
