chore: checkstyle 수정

src/main/java/com/example/demo/domain/EmailSenderImpl.java

@@ -13,14 +13,13 @@ public class EmailSenderImpl implements EmailSender {
 	private JavaMailSender mailSender;
 
 	@Value("${mail.from}")
-	private String EMAIL_FROM;
+	private String mailFrom;
 
 	@Override
 	public void sendSimpleMessage(String to, String subject, String text) {
 		SimpleMailMessage message = new SimpleMailMessage();
 		//setFrom에 들어가는 이메일 주소는 실제 발송 주소와 관련이 없다.
-		// Note that even though it’s not mandatory to provide the from address, many SMTP servers would reject such messages.
-		message.setFrom(EMAIL_FROM);
+		message.setFrom(mailFrom);
 		message.setTo(to);
 		message.setSubject(subject);
 		message.setText(text);

src/main/java/com/example/demo/service/MailServiceImpl.java

@@ -35,5 +35,4 @@ private MemberImpl findMemberById(Long memberId) {
 		return memberRepository.findById(memberId)
 			.orElseThrow(() -> new CafegoryException(MEMBER_NOT_FOUND));
 	}
-
 }

src/test/java/com/example/demo/domain/EmailSenderImplTest.java

@@ -15,4 +15,4 @@ void sendSimpleMessage() {
 		emailSender.sendSimpleMessage("[email protected]", "테스트 제목", "테스트 내용");
 	}
 
-}
+}