Short solution needed: "How to join in Rust" (rust)

[nonunicorn]

Please help us write most modern and shortest code solution for this issue: How to join in Rust (technology: rust)

Fast way

Just write the code solution in the comments.

Prefered way

1. Create pull request with a new code file inside inbox folder.
2. Don't forget to use comments explain solution.
3. Link to this issue in comments of pull request.

[nonunicorn]

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