public ActionResult <StudentDTO> AddNewStudentToClassList([FromBody] Student student)
        {
            string userId = User?.Identity?.Name;

            if (string.IsNullOrEmpty(userId))
            {
                return(Forbid());
            }

            bool invalidRequest = string.IsNullOrEmpty(student.FirstName) ||
                                  string.IsNullOrEmpty(student.LastName) ||
                                  student.FeePayable == null;

            if (invalidRequest)
            {
                return(BadRequest("One or more required fields were not supplied."));
            }

            Student    createdStudent = StudentService.AddStudentToClassList(student, int.Parse(userId));
            StudentDTO dto            = new StudentDTO(createdStudent);

            return(Ok(dto));
        }