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detailPost 코틀린 파일에서 Runnable interface를 상속받아서 thread를 생성했습니다. 해당 부분은 주석 처리 되어있습니다.
coroutine도 구현했습니다. coroutine의 명확한 개념이 잡히지 않았었는데 스터디 때 thread와는 달리 작업을 나누지만 별도의 address space 공간을 크게 할당 받지 않아서 context switching에서 overhead가 적다는 것을 깨달았습니다. 안드로이드에서 작업을 나누어 처리하고 싶을 때 thread 도 있지만 overhead를 줄인다는 점에서 coroutine의 의의도 깨달았습니다.
6주차 PR이 merge되어 있지 않아서 그냥 7주차 PR이랑 합쳤습니다.