chore: remove todo and improve some code in src/library.rs

[ThomasFrans]

Remove a to-do and do some related cleanup.

Describe your changes

• Remove a documentation to-do
• Do some related code cleanup

Issue ticket number and link

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Checklist before requesting a review

• Documentation was updated (i.e. due to changes in keybindings, commands, etc.)
• Changelog was updated with relevant user-facing changes (eg. not dependency updates,
  not performance improvements, etc.)

[ThomasFrans]

Just needed to write some Rust, any Rust at all as I've been drowning in C++ 😩 Never hurts to clean up a bit.