forward IsInTaxi(carid);

public IsInTaxi(carid)
{
    new carmodel = GetVehicleModel(carid);
    if(carmodel == 420)
    {
        return 1;
    }
    return 0;
}

else if(strcmp(name, "taxi", true) == 0)
                {
                  if(IsInTaxi(GetPlayerVehicleID(playerid)))
                  {
                    SendClientMessage(playerid, orange, "[OBJECTIVE]: Drive your taxi to the checkpoints, driving as carefully as possible.");
                        SendClientMessage(playerid, white, "[HINT]: The less damage taken, the more you will get paid.");
                        Checkpoint[playerid] = 24;
                        SetPlayerCheckpoint(playerid, 1818.8019,-1911.5210,13.1685, 3);
                  }
                }

else if(Checkpoint[playerid] == 35) //Taxi End
    {
      new Float:health;
      new veh;
      new vehicle;
      veh = GetPlayerVehicleID(playerid);
      GetVehicleHealth(veh, health);
      if(health > 900) { SendClientMessage(playerid, white, "Your taxi was returned in excellent condition, you have earned $40."); SGivePlayerMoney(playerid, 40); }
        if(health < 800) { SendClientMessage(playerid, white, "Your taxi was returned in poor condition, you have earned $20."); SGivePlayerMoney(playerid, 20); }
      Checkpoint[playerid] = 0;
      vehicle = GetPlayerVehicleID(playerid);
      RemovePlayerFromVehicle(playerid);
      SetVehicleToRespawn(vehicle);
        DisablePlayerCheckpoint(playerid);
        PlayerPlaySound(playerid,1085,0.0,0.0,0.0);
    }