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안녕하세요! 리뷰어님. 늦게 제출하여 죄송합니다.
전체적으로 너무 어려워 기존의 코드를 계속 수정하고, 파일들을 새로 생성하고, 지우고를 반복하다보니 전체적으로 너무 파일이 많아진 느낌이 듭니다. 특히 6단계를 구현하며 null관련된 처리에서 시간이 많이 걸렸습니다. 이 부분에 관해서 제가 구현한 부분이 괜찮은지 피드백 주시면 공부하도록 하겠습니다!
4, 5, 6단계 코드