diff --git a/src/main/java/org/cmh/backend/CourseManagement/service/CourseService.java b/src/main/java/org/cmh/backend/CourseManagement/service/CourseService.java
index 34f34b7..d8c3926 100644
--- a/src/main/java/org/cmh/backend/CourseManagement/service/CourseService.java
+++ b/src/main/java/org/cmh/backend/CourseManagement/service/CourseService.java
@@ -1,99 +1,3 @@
-//package org.cmh.backend.CourseManagement.service;
-//
-//import org.cmh.backend.CourseManagement.model.Course;
-//import org.cmh.backend.CourseManagement.repository.CourseRepository;
-//import org.springframework.beans.factory.annotation.Autowired;
-//import org.springframework.stereotype.Service;
-//import org.springframework.web.multipart.MultipartFile;
-//
-//import java.io.IOException;
-//import java.nio.file.Files;
-//import java.nio.file.Path;
-//import java.nio.file.Paths;
-//import java.util.List;
-//import java.util.Optional;
-//
-//@Service
-//public class CourseService {
-//
-//    @Autowired
-//    private CourseRepository courseRepository;
-//
-//    public Course createCourse(String name, String description, String author, String sortOrder, MultipartFile coverImage, MultipartFile video) {
-//        Optional<Course> existingCourse = courseRepository.findByName(name);
-//        if (existingCourse.isPresent()) {
-//            return null;
-//        }
-//
-//        Course course = new Course();
-//        course.setName(name);
-//        course.setDescription(description);
-//        course.setAuthor(author);
-//        course.setSortOrder(sortOrder);
-//
-//        try {
-//            if (coverImage != null && !coverImage.isEmpty()) {
-//                String coverImagePath = saveFile(coverImage);
-//                course.setCoverImagePath(coverImagePath);
-//            }
-//            if (video != null && !video.isEmpty()) {
-//                String videoPath = saveFile(video);
-//                course.setVideoPath(videoPath);
-//            }
-//        } catch (IOException e) {
-//            e.printStackTrace();
-//            return null;
-//        }
-//
-//        return courseRepository.save(course);
-//    }
-//
-//    public Course updateCourse(Long id, String name, String description, String author, String sortOrder, MultipartFile coverImage, MultipartFile video) {
-//        return courseRepository.findById(id)
-//                .map(course -> {
-//                    course.setName(name);
-//                    course.setDescription(description);
-//                    course.setAuthor(author);
-//                    course.setSortOrder(sortOrder);
-//
-//                    try {
-//                        if (coverImage != null && !coverImage.isEmpty()) {
-//                            String coverImagePath = saveFile(coverImage);
-//                            course.setCoverImagePath(coverImagePath);
-//                        }
-//                        if (video != null && !video.isEmpty()) {
-//                            String videoPath = saveFile(video);
-//                            course.setVideoPath(videoPath);
-//                        }
-//                    } catch (IOException e) {
-//                        e.printStackTrace();
-//                        return null;
-//                    }
-//
-//                    return courseRepository.save(course);
-//                }).orElse(null);
-//    }
-//
-//    private String saveFile(MultipartFile file) throws IOException {
-//        String filename = System.currentTimeMillis() + "_" + file.getOriginalFilename();
-//        Path filePath = Paths.get("uploads", filename);
-//        Files.createDirectories(filePath.getParent());
-//        Files.write(filePath, file.getBytes());
-//        return filePath.toString();
-//    }
-//
-//    public boolean deleteCourse(Long id) {
-//        return courseRepository.findById(id)
-//                .map(course -> {
-//                    courseRepository.delete(course);
-//                    return true;
-//                }).orElse(false);
-//    }
-//
-//    public List<Course> getAllCourses() {
-//        return courseRepository.findAll();
-//    }
-//}
 package org.cmh.backend.CourseManagement.service;
 
 import jakarta.persistence.EntityNotFoundException;