cmd of trackcar

CMD:trackcar(playerid, params[])
{
    new str[500];
    new count=0;
    for (new i = 0; i < MAX_DYNAMIC_CARS; i++)
    {
        if(Car_IsOwner(playerid, i))
        {
        new float:fX,float:fY,float:fZ;
        GetVehiclePos(CarData[i][carVehicle], fX, fY, fZ);
        new str2[128];
        format(str2,sizeof(str2)," %s | Location: %s \n", ReturnVehicleModelName(CarData[i][carModel]),GetLocation(fX, fY, fZ));
        strcat(str, str2);
        count++;
        }
    }
    if(count==0)
    {
      SendClientMessage(playerid, COLOR_WHITE, "You don't own any vehicles.");
    }
    else{
       ShowPlayerDialog(playerid, 557,DIALOG_STYLE_LIST,"Select a car to get it's location",str,"Track","Exit");
    }
    return 1;
}