Unclarity on what is game code and what's just examples #29
Description
In https://snake.rustbridge.com/11-ownershipborrowing new code with a new main function is introduced.
It's unclear that this code doesn't go into the snake code, but into a new file or should be tried on the Playground.
This should be indicated more clearly (I think mdbook might have a way to add a "open in playground" button?)