public string ManufactureTank(string name, double attackPoints, double defensePoints)
{
Tank tank = new Tank(name, attackPoints, defensePoints);
if (this.machines.Contains(tank))
{
return(string.Format(OutputMessages.MachineExists, name));
}
tank.CalculatePoints();
this.machines.Add(tank);
string result = string.Format(OutputMessages.TankManufactured, name, tank.AttackPoints, tank.DefensePoints, tank.DefenseMode == true ? "ON" : "OFF");
return(result);
}