cargo test panic

[BaldDemian]

5 test cases failed due to the char::to_digit call: to_digit: invalid radix -- radix must be in the range 2 to 36 inclusive.

I believe this is caused by the change of char::to_digit method after Rust 1.84.0.

https://github.com/rust-lang/rust/commit/aeffff8ecf84a0a49ee597fb41729f8de9972592

[BaldDemian]

For those who encountered the same problem, simply downgrade the Rust version to 1.83.0 in this project by running: rustup install 1.83.0 and rustup override set 1.83.0