public void ChangeLogin(string text, IOnCompleteListener c)
        {
            FirebaseUser user = FirebaseAuth.Instance.CurrentUser;

            if (user != null)
            {
                UserProfileChangeRequest.Builder profileUpdates = new UserProfileChangeRequest.Builder();
                profileUpdates.SetDisplayName(text);
                UserProfileChangeRequest updates = profileUpdates.Build();
                user.UpdateProfile(updates).AddOnCompleteListener(c);
            }
            else
            {
                throw new Exception("Current user is null");
            }
        }