public string[] Process(IGameMaster gameMaster)
 {
     if (gameMaster.GameEndDate > ReceiveDate || gameMaster.GameStartDate > ReceiveDate || gameMaster.IsGameFinished)
     {
         return(null);
     }
     return(new string[] { gameMaster.HandleRejectKnowledgeExchange(this)?.Serialize() });
 }