Bracket.rs throwing error at runtime.

Good evening, I recently bought your book and was starting the Dungeon Crawler section when at run time Rust throws the following error;

```
warning: `dungeoncrawler` (bin "dungeoncrawler") generated 2 warnings
Finished `dev` profile [unoptimized + debuginfo] target(s) in 0.15s
Running `target/debug/dungeoncrawler`

thread 'main' panicked at /home/matt/.cargo/registry/src/index.crates.io-1949cf8c6b5b557f/freetype-rs-0.26.0/src/bitmap.rs:67:13:
unsafe precondition(s) violated: slice::from_raw_parts requires the pointer to be aligned and non-null, and the total size of the slice not to exceed `isize::MAX`

This indicates a bug in the program. This Undefined Behavior check is optional, and cannot be relied on for safety.
stack backtrace:
```

I tried running the flappy program I had wrote previously that worked and got the same error on bracket.rs

Kind regards,

Matt