Modify the Interface sample program by adding another Interface class that would produce the following output (new output in BOLD):

Shutdown HiVac chamber? Y or N ->: y Heater shutting down... Heater power off... Heater at ambient temperature. Gate valves closing... All gate valves closed. HiVac turbo spinning down... HiVac turbo spun down Currently @ 0.0 rpm. Pressure release valve on HiVac chamber opening... Pressure @ 1 atmosphere (760 torr) Safe to open chamber. The production line has been suspended.

Pumping down chamber... Chamber pumped down and @ 0 torr. HiVac turbo spinning up... HiVac turbo @ speed. Gate valves opening... All gate valves open. Heater power on... Heater starting... Heater at operating temperature. System ready for production.

Please upload ONLY the new code/edited sections and new class in a PDF or text file form.