A repair company has observed that the number of repeat repairs has increased. To reduce the number of mistakes when fixing a product, the company has contracted you to come up with a program that can trace the disassembly steps of a product so that the re-assembly can be output. Write a program that uses a stack. Each disassembly step is pushed onto the stack. When it is time to re-assemble the product, the stack can be popped until no items are remaining. There may be some disassembly steps that do not have a one-to-one mapping with an assembly step. For these cases, use an enumerated type to indicate if the step is optional or required.