[12기] 장유진 과제 제출합니다. #19
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리팩토링을 완벽하게 하지는 못했지만, test를 완료했습니다. 나중에 시간이 될 때 enum class를 활용하는 방식으로 더 디벨롭해보면 좋을 것 같습니다.