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Objectives
Write a program that will work endlessly to make coffee for all interested persons until the shutdown signal is given. Introduce two new options: "remaining" and "exit".
Do not forget that you can be out of resources for making coffee. If the coffee machine doesn't have enough resources to make coffee, the program should output a message that says it can't make a cup of coffee and state what is missing.
And the last improvement to the program at this step — if the user types "buy" to buy a cup of coffee and then changes his mind, they should be able to type "back" to return into the main cycle.