New directory for extra tests

[sdanailo-42]

In our PDF a case like /bin/echo \$USER should not be covered, since it states that \ shouldn't be covered at all. Same goes for env -i $MINISHELL_PATH"/"$EXECUTABLE, since env should not accept any options or arguments. I'm assuming the PDF for all campuses is the same.

Should we create a new folder called extra where we move all of those tests there, to prevent confusion, but still keep them for people who want to try them, since this is not mandatory to cover?

[zstenger93]

Maybe, but it's a minor thing. If you are that bored, you are welcome :D
Env -i is only there to check for segfaults which you can protect in like 2 minutes or take the challenge and make it work, you will see interesting things.
The same goes for the escape characters.