Yes it's true. For the moment, it's like chinese for me 
But Great News, i've followed @alanhkarp 's suggestion. After a ton of expect("with some funny message inside") the evil unwrap who make my game panic is appear... A dark story of Deadly Path.
So this path problem is now solve . All is running.
Thanks a lot to all member of this community who have spent a few time to help a poor RustyNewbie