getAvatar method
Implementation
String? getAvatar() {
  if (team != null) {
    return team!.avatar;
  } else if (friend != null) {
    return friend!.user.avatar;
  }
  return null;
}String? getAvatar() {
  if (team != null) {
    return team!.avatar;
  } else if (friend != null) {
    return friend!.user.avatar;
  }
  return null;
}