Did you consider using an established Rust verification toolchain like Aeneas?
Edit: I don't do this often, but why is my question being downvoted? Is this question not allowed?
Edit: I don't do this often, but why is my question being downvoted? Is this question not allowed?
"Aeneas currently functionalizes a subset of safe Rust, and we are in the process of extending the functional model with reasoning based on separation logic to support unsafe code and concurrent code."