private void HandleCommand(Connection c, String command, String msg)
        {
            switch (command)
            {
            case "ACK":
                break;

            case "GET_ALIVE":
                String output = DataPackages.GetInstance().AckMessage();
                byte[] data   = Encoding.UTF8.GetBytes(output);
                c.SendData(data, (ushort)data.Length);
                Console.WriteLine($"[Server -> Client]: {Encoding.UTF8.GetString(data)}");
                break;

            case "SYSTEM_LOGIN":
                break;

            case "GET_FILENAMES":
                break;

            case "GET_FILE":
                break;

            case "CREATE_FILE":
                break;

            case "DELETE_FILE":
                break;

            case "GET_PATIENTS":
                break;
            }
        }
 public static DataPackages GetInstance()
 {
     if (instance == null)
     {
         instance = new DataPackages();
     }
     return(instance);
 }