@Override
 public void createClub(ClubData clubData) {
   Club existingClub = clubRepository.findByAcronym(clubData.getAcronym());
   if (existingClub != null) {
     throw new ElementAlreadyExistsException("There is already a club with this acronym");
   }
   clubRepository.save(convertClub(clubData));
 }
 @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);
 }