code: @SuppressWarnings({ "unchecked"})
      @Override
      public <T> T by(ApiBaseUser user) {
          User sfsUser = CommandUtil.getSfsUser(user, api);
          if(sfsUser == null) return null;
          Room sfsRoom = sfsUser.getLastJoinedRoom();
          if(sfsRoom == null) return null;
          return (T)sfsRoom.getProperty(APIKey.ROOM);
      }
docs: /* (non-Javadoc)
  @see com.tvd12.ezyfox.core.command.GetRoom#by(com.tvd12.ezyfox.core.entities.ApiBaseUser)