Feature-change_direction #16
Merged
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늦게 올려 죄송합니다.
cd 구현 관련해서 --help와 -[option]은 이후 built in 함수들이 어떻게 연결될지 몰라 미구현 상태로 놓았습니다.
차후에 built in들을 모두 구현해야 되게 된다면 그때 다시 수정하겠습니다.