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요약
세부사항
AS-IS
기존 로직에서는 알림을 보내는 서비스에서 slack 알림 구현체를 직접 의존하고 있었습니다.
TO-BE
추후 gmail smtp 등 다른 서비스로 변경될 수 있기 때문에, 외부 서비스에 의존하는 부분을 추상화에 의존할 수 있도록 인터페이스를 생성했습니다.