Merge branch 'task-implementation-course' into 'main'

.gitignore

build.gradle

gradle/wrapper/gradle-wrapper.jar

gradle/wrapper/gradle-wrapper.properties

gradlew

gradlew.bat

settings.gradle

src/main/java/id/ac/ui/tutorial0/Tutorial0Application.java

...in/java/id/ac/ui/tutorial0/controller/BaseController.java

.../java/id/ac/ui/tutorial0/controller/CourseController.java

...java/id/ac/ui/tutorial0/controller/StudentController.java

.../ui/tutorial0/exception/DuplicateCourseNameException.java

...ui/tutorial0/exception/DuplicateStudentNameException.java

src/main/java/id/ac/ui/tutorial0/model/Course.java

src/main/java/id/ac/ui/tutorial0/model/Student.java

.../java/id/ac/ui/tutorial0/repository/CourseRepository.java

...java/id/ac/ui/tutorial0/repository/StudentRepository.java

src/main/java/id/ac/ui/tutorial0/service/CourseService.java

...in/java/id/ac/ui/tutorial0/service/CourseServiceImpl.java

src/main/java/id/ac/ui/tutorial0/service/StudentService.java