static void Main(string[] args)
{
Thermostat thermostat = new Thermostat();
Heater heater = new Heater(30);
Cooler cooler = new Cooler(40);
thermostat.EmulateTemperatureChange();
heater.OnTemperatureChanged(thermostat.CurrentTemperature);
cooler.Update(thermostat.CurrentTemperature);
thermostat.EmulateTemperatureChange();
heater.OnTemperatureChanged(thermostat.CurrentTemperature);
cooler.Update(thermostat.CurrentTemperature);
}