Maciek refactor works + delete unnecesery interface (conception changed)

buisnesslogic/src/main/java/com/plannaplan/services/CourseService.java

@@ -1,6 +1,7 @@
 package com.plannaplan.services;
 
 import java.util.List;
+import java.util.Optional;
 
 import com.plannaplan.entities.Course;
 import com.plannaplan.repositories.CourseRepository;
@@ -13,7 +14,7 @@ public class CourseService {
     @Autowired
     private CourseRepository repo;
 
-    public Course getCourseByName(String name) {
+    public Optional<Course> getCourseByName(String name) {
         return this.repo.findByName(name);
     }
 
@@ -21,15 +22,16 @@ public class CourseService {
         return this.repo.findAll();
     }
 
-    public void save(Course course) {
+    public Course save(Course course) {
         this.repo.save(course);
+        return course;
     }
 
-    public void delete(Course course){
+    public void delete(Course course) {
         this.repo.delete(course);
     }
 
-    public int getCoursesAmmount(){
-        return (int)this.repo.count();
+    public int getCoursesAmmount() {
+        return (int) this.repo.count();
     }
 }