feat(language): remove rustlang removed "box" keyword

[Huterenok]

Description

Removes Rust language "box" keyword, as it was removed a long time ago in rust-lang/rust#49733

[github-actions]

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Title "feat(language): remove rustlang removed "box" keyword"
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feat: add new feature (@github_username)
impr(quotes): add english quotes (@username)
fix(leaderboard): show user rank correctly (@user1, @user2, @user3)