Space Engineers - Symple Hydrogen Trade

//Space Engineers - Symple Hydrogen Trade scrips v0.1 by swagman //instruction: https://youtu.be/uOwzDUgW4z4
public Program() { Runtime.UpdateFrequency = UpdateFrequency.Update10; }

float LitersPerSC = 7; //price
double LitersOld;

public void Main(string arg) {/*mon init*/var m = Me.GetSurface(0); m.ContentType = ContentType.TEXT_AND_IMAGE; m.FontSize = 26.4f/15; m.TextPadding = 0;m.Font = "Monospace"; m.FontColor = Color.Gray; m.BackgroundColor = new Color(0,0,7);

  var tn = GridTerminalSystem.GetBlockWithName("!Tank") as IMyGasTank;
  var sc = GridTerminalSystem.GetBlockWithName("!Connector") as IMyShipConnector;

  MyItemType Сurrency = new MyItemType("MyObjectBuilder_PhysicalObject", "SpaceCredit");

  var LitersCurr = tn.Capacity * tn.FilledRatio;
  m.WriteText($"=HYDRO FUELING=\nHAVE:{LitersCurr:F0} L\n  BY:{LitersPerSC} L/SC\n");

  if (sc.Status==MyShipConnectorStatus.Connected) {
    var oi = sc.OtherConnector.GetInventory();
    var cash = oi.GetItemAt(0);
    var money = cash?.Type==Сurrency ? cash?.Amount : 0;
    if (money==0) sc.Disconnect(); else {
      var diff = LitersOld - LitersCurr;
      int pay = (int)Math.Truncate(diff / LitersPerSC);
      sc.GetInventory().TransferItemFrom(oi, 0, null, true, pay );
      LitersOld = LitersCurr + (diff - pay * LitersPerSC);
    };
    m.WriteText($"CASH:{money} SC\n  OR:{money*LitersPerSC} L",true);
  } else LitersOld = LitersCurr;
}