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Why need this change? 이 PR에 어떤 작업이 포함됐는지, 무슨 이유로 코드를 변경했는지에 대한 내용을 요약합니다. 또는 관련 문서를 링크합니다.
#22
Changes ✏️ 주요 수정 사항을 기재합니다. 핵심 수정사항은 커밋 Hash와 함께 기재합니다.
6a59664: null 처리, getTeacher 추가
910d74a: gender validation 추가
Test checklist✅ (optional) 테스트 계획 또는 완료 사항을 기재합니다.