chore(utils): intersection 내부구현 수정 완료 #266
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Overview
Issue: #265
별도의 함수를 두어 계산하던 중복제거 intersection을 가독성을 위해 intersectionWithDuplicates와 uniq 함수의 조합으로 변경하였습니다.
내부구현만 변경하였기에 테스트코드와 문서에는 수정사항이 없습니다.
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