public List<Course> findMyCourses() {
   return LearningEngineDatabase.getMyCourses();
 }
 public void insertInMyCourses(Course course) {
   LearningEngineDatabase.addMyCourse(course);
 }
 public void insert(Course course) {
   LearningEngineDatabase.addCourse(course);
 }
 public List<Course> findAll() {
   return LearningEngineDatabase.getAllCourses();
 }