refactor(phone): normalize phone lookup in recruit services

Author: CSE-Shaco

src/main/java/inha/gdgoc/domain/recruit/member/service/RecruitMemberService.java

@@ -59,7 +59,7 @@ public void addRecruitMember(ApplicationRequest applicationRequest) {
 
     @Transactional
     public void addRecruitMemberMemo(RecruitMemberMemoRequest recruitMemberMemoRequest) {
-        String cleanPhone = recruitMemberMemoRequest.getPhoneNumber().replaceAll("[^0-9]", "");
+        String cleanPhone = normalizePhoneNumber(recruitMemberMemoRequest.getPhoneNumber());
         if (recruitMemberRepository.existsByPhoneNumber(cleanPhone)) {
             throw new RecruitMemberException(RECRUIT_MEMBER_ALREADY_APPLIED);
         }
@@ -74,7 +74,7 @@ public CheckStudentIdResponse isRegisteredStudentId(String studentId) {
     }
 
     public CheckPhoneNumberResponse isRegisteredPhoneNumber(String phoneNumber) {
-        String cleanPhone = phoneNumber.replaceAll("[^0-9]", "");
+        String cleanPhone = normalizePhoneNumber(phoneNumber);
         boolean exists = recruitMemberRepository.existsByPhoneNumber(cleanPhone);
 
         return new CheckPhoneNumberResponse(exists);
@@ -116,4 +116,8 @@ public Page<RecruitMember> searchMembersByNamePage(String name, Pageable pageabl
         return recruitMemberRepository.findByNameContainingIgnoreCase(name, pageable);
     }
 
+    private String normalizePhoneNumber(String phoneNumber) {
+        return phoneNumber.replaceAll("[^0-9]", "");
+    }
+
 }

src/main/java/inha/gdgoc/domain/user/service/UserService.java

@@ -68,4 +68,5 @@ private String maskEmail(String email) {
                 + localPart.substring(localPart.length() - endLen)
                 + domainPart;
     }
-}
+
+}