private Coach convertCoach(CoachData coachData) {
   Coach coach = new Coach();
   coach.setName(coachData.getName());
   coach.setMail(coachData.getEmail());
   coach.setTel(coachData.getPhoneNumber());
   return coach;
 }
 @Override
 public void updateClub(ClubData clubData) {
   Club club = findClub(clubData.getAcronym());
   club.setName(clubData.getName());
   Coach coach = club.getCoach();
   coach.setName(clubData.getCoach().getName());
   coach.setMail(clubData.getCoach().getEmail());
   coach.setTel(clubData.getCoach().getPhoneNumber());
   clubRepository.save(club);
 }