$15\mathrm{.}5\mathrm{.}1$: Define a subclass that simulates a sloth.

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The Critter class is a superclass with some basic functionality for running simulations of different kinds of critters. As you can see, critters can move and they remember their history. A typical simulation contains a number of critters of different types. In each step of the simulation, the act method will be called on each critter.

Define a subclass Sloth of Critter that simulates a sloth. Sloths alternate between eating $($their initial activity$)$ and sleeping. Add the word "eat" or "sleep" to the history each time the act method is called.