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?: sort에서 a,b를 가공하고 비교
관사를 제거하고 비교하기 위해 관사를 제거하는 함수 생성
위 함수는 정규표현식을 사용함
정렬 시 비교할 대상에 위 함수를 이용해 관사 제거하고
List 자료형의 요소 연결 시 join으로 "," 제거