Drain Capping

Take your drain method from the previous exercise and prevent it from being drained below a volume of 0.

What is expected

tub = Bathtub("white", 20)
tub.drain(15)
print(tub.current_volume)  # should be 5
tub.drain(15)
print(tub.current_volume)  # should be 0, NOT -10

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