refactor: many rust improvements #3

Fishrock123 · 2022-07-28T20:16:57Z

rustfmt formatting
clippy linting
Use .map_err() instead of match where appropriate.
Removed some intermediately utf8 validation (i.e bytes->str->json is now bytes->json).
- Use temp_to_vector where possible instead of temp_to_string.
Removed some unnecessary memcopys
- Avoid .to_vec().
- Uses std::borrow::Cow to avoid another vector allocation.
Uses implicit return when appropriate.

Update based on rust 1.62 - rustfmt formatting - clippy linting - Use `.map_err()` instead of `match` where appropriate. - Removed some intermediately utf8 validation (i.e bytes->str->json is now bytes->json). - Use `temp_to_vector` where possible instead of `temp_to_string`. - Removed some unnecessary `memcopy`s - Avoid `.to_vec()`. - Uses `std::borrow::Cow` to avoid another vector allocation. - Uses implicit return when appropriate.