Implementing the gg_whac project

In this section, we will examine the gg_whac project, which is an implementation in the ggez framework of the famous Whack-A-Mole arcade game. First of all, let's try to play it.

After running cargo run --release in the gg_whac folder, the following window will appear, which shows a lawn:

For those of you who aren't familiar with this game, here are the rules. When you click on the Start button, the following things happen:

1. The Start button disappears.
2. The countdown begins at the top left from 40 seconds to 0.
3. A nice mole pops up in a random position of the lawn.
4. The mouse cursor becomes a barred circle.
5. If you move your mouse cursor over the mole, it becomes a cross and a big mallet appears; this mallet can be dragged by the mouse as long as you remain over the mole.

Your window should look similar to the following:

If you click the main mouse button when the mouse cursor hovers over the mole, the mole disappears and another one appears...