public async Task <Student> Update(string id, Person person)
        {
            try
            {
                var students = await _repository.Get(id);

                var numara = students.Number;

                if (students != null)
                {
                    IStudentBuilder builder = new StudentBuilder(person);
                    builder.BuildMail();
                    builder.BuildClass();
                    builder.BuildNumber((int.Parse(numara.Substring(4, 7)) - 1));


                    _ = await _repository.Update(id, builder.Result());

                    NewStudentSystemController newStudentSystemController = new NewStudentSystemController(_repositoryNewStudentSystem);
                    _ = newStudentSystemController.Update(id, builder.Result());
                }

                return(students);
            }
            catch (Exception)
            {
                return(null);
            }
        }
        public async Task <ActionResult <Student> > Create(Person person)
        {
            try
            {
                var students = await _repository.Get();

                students ??= new List <Student>();
                IStudentBuilder builder = new StudentBuilder(person);
                builder.BuildMail();
                builder.BuildClass();
                builder.BuildNumber(students.Count);
                var student = await _repository.Create(builder.Result());

                NewStudentSystemController newStudentSystemController = new NewStudentSystemController(_repositoryNewStudentSystem);
                _ = newStudentSystemController.Create(student);

                return(student);
            }
            catch (Exception)
            {
                return(UnprocessableEntity());
            }
        }