getLastMessage static method 
    
    
    
  Implementation
  static String getLastMessage(
    Conversation conversation, BuildContext context) {
  BaseMessage message = conversation.lastMessage!;
  String messageType = message.type;
  String subtitle;
  switch (messageType) {
    case MessageTypeConstants.text:
      subtitle = (message as TextMessage).text;
      if (message.mentionedUsers.isNotEmpty) {
        subtitle = CometChatMentionsFormatter.getTextWithMentions(
            message.text, message.mentionedUsers);
      }
      break;
    case MessageTypeConstants.image:
      subtitle = Translations.of(context).messageImage;
      break;
    case MessageTypeConstants.video:
      subtitle = Translations.of(context).messageVideo;
      break;
    case MessageTypeConstants.file:
      subtitle = Translations.of(context).messageFile;
      break;
    case MessageTypeConstants.audio:
      subtitle = Translations.of(context).messageAudio;
      break;
    default:
      subtitle = messageType;
  }
  return subtitle;
}