In this app, there are several widgets building two nested widgets.
The '+' button should increase the number held by the nested widget beneath. The conditions to be met are:
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You can only change/have 1 new StatefulWidget in the project (i.e., convert one Stateless widget to Stateful).
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You can add as many variables/constants, constructors, and parameters/arguments as you need.
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You can only add one new function (if you need more, you must justify it).
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You cannot create new classes that inherit from StatefulWidget or StatelessWidget (of course, when changing to a StatefulWidget, you can have its associated State class).
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YOU CANNOT USE ANY PACKAGES.
Add another button "-" that every time is tapped, it subtracts 1 to the counter. Note that the value should never be below 0.