Linked List implementation is unsound

[CordlessCoder]

• get* methods conjure 'static references that can be held beyond the lifetime of the list, which is unsound
• get* methods take a mutable reference, which is unnecessary
• no get_mut methods
• incorrectly uses i32 for indexing instead of usize

[CordlessCoder]

I will attempt to address these in a PR

[github-actions]

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[github-actions]

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