public ProfessorDTO ToDTO(Professor professor)
        {
            var professorDTO = new ProfessorDTO
            {
                ID        = professor.ID,
                FirstName = professor.FirstName,
                LastName  = professor.LastName
            };

            return(professorDTO);
        }
        public IActionResult UpdateProfessor([FromBody] ProfessorDTO professorToUpdate)
        {
            var professor = professorService.GetProfessorById(professorToUpdate.ID);

            if (professor == null)
            {
                return(NotFound());
            }
            professorService.UpdateProfessor(professorToUpdate.ID, professorToUpdate.FirstName, professorToUpdate.LastName);
            professor = professorService.GetProfessorById(professorToUpdate.ID);
            return(NoContent());
        }