fix: remove extern crate syntax, use syntax of the 2018 edition

[zscumt123]

Summary

Related issue (if exists)

Types of changes

• Docs change / Dependency upgrade
• Bug fix
• New feature / Improvement
• Refactoring
• Breaking change

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• I have added changeset via pnpm run changeset.
• I have added tests to cover my changes.

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Latest commit: 13a7c7b

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[hyf0]

LGTM. Thank you!