Silver Challenge
Create another subclass of the Monster type. Call this one Vampire. Override the terrorizeTown() function so that every time an instance of the Vampire type terrorizes a town, it adds a new vampire thrall to an array of vampires on the Vampire type. This array of vampire thralls should be empty by default. Terrorizing a town should also decrement the town’s population by one. Last, exercise this Vampire type in main.swift.
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