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📄 작업 내용 요약
Auction에서 Optional로 lastBid를 반환하도록 했고
checkInvalidBid()에서 Optional.ifPresentOrElse()를 활용해 분기 처리를 없애고 Optional의 람다식으로 처리했습니다
🙋🏻 리뷰 시 주의 깊게 확인해야 하는 코드
이슈에 왜 이런 제안을 했는지에 대한 내용을 살짝 자세히 적어놨습니다
📎 Issue 번호