public async Task RegisterMasterAsync(string name, string surname, string email, string phoneNumber, string password)
{
if (await _masterService.ExistByEmailAsync(email.ToLowerInvariant()))
{
throw new ObjectAlreadyExistException($"User of given email: {email} already exist.");
}
var master = new Master(name, surname, email, phoneNumber, password);
var activationKey = Guid.NewGuid();
master.AddAccountActivation(new AccountActivation(activationKey));
await _masterRepository.AddAsync(master);
await _accountEmailFactory.SendActivationEmailAsync(master, activationKey);
}