Challenge 23: Verify the safety of `Vec` functions part 1

[thanhnguyen-aws]

Runbook Link

https://model-checking.github.io/verify-rust-std/challenges/0023-vec-pt1.html

[Lysxia]

The link responds 404 because #267 has not been merged. Is this challenge considered open already?

[thanhnguyen-aws]

This challenge will be open shortly. Thank you for being interested.