Soltions for rustling to exercise n°75, will update when others are complete.
Try doing yourself before !
To install rustlings :
https://github.com/rust-lang/rustlings
curl --proto '=https' --tlsv1.2 -sSf https://sh.rustup.rs | sh
curl -L https://raw.githubusercontent.com/rust-lang/rustlings/main/install.sh | bash