♻️ refactor : StringUtils import문 수정, 메서드명 수정

Author: silver-eunjoo

backend/build.gradle

@@ -44,6 +44,7 @@ dependencies {
 	testImplementation 'org.springframework.security:spring-security-test'
 
 	/* ETC */
+	implementation 'org.apache.commons:commons-lang3:3.12.0'
 	annotationProcessor 'org.projectlombok:lombok'
 	compileOnly 'org.projectlombok:lombok'
 

backend/src/main/java/io/f1/backend/domain/quiz/app/QuizService.java

@@ -18,7 +18,6 @@
 import io.f1.backend.domain.quiz.entity.Quiz;
 import io.f1.backend.domain.user.dao.UserRepository;
 import io.f1.backend.domain.user.entity.User;
-import io.micrometer.common.util.StringUtils;
 
 import lombok.RequiredArgsConstructor;
 import lombok.extern.slf4j.Slf4j;
@@ -29,6 +28,7 @@
 import org.springframework.stereotype.Service;
 import org.springframework.transaction.annotation.Transactional;
 import org.springframework.web.multipart.MultipartFile;
+import org.apache.commons.lang3.StringUtils;
 
 import java.io.IOException;
 import java.nio.file.Path;
@@ -120,7 +120,7 @@ public void deleteQuiz(Long quizId) {
             throw new RuntimeException("권한이 없습니다.");
         }
 
-        deleteOldThumbnailFileIfNeeded(quiz.getThumbnailUrl());
+        deleteThumbnailFile(quiz.getThumbnailUrl());
         quizRepository.deleteById(quizId);
     }
 
@@ -145,12 +145,12 @@ public void updateQuiz(Long quizId, MultipartFile thumbnailFile, QuizUpdateReque
             validateImageFile(thumbnailFile);
             String newThumbnailPath = convertToThumbnailPath(thumbnailFile);
 
-            deleteOldThumbnailFileIfNeeded(quiz.getThumbnailUrl());
+            deleteThumbnailFile(quiz.getThumbnailUrl());
             quiz.changeThumbnailUrl(newThumbnailPath);
         }
     }
 
-    private void deleteOldThumbnailFileIfNeeded(String oldFilename) {
+    private void deleteThumbnailFile(String oldFilename) {
         if (oldFilename.contains(DEFAULT)) {
             return;
         }