(notice: I am not a Rust or C/C++ expert)

Doing all that is creating a completely separate programming language from C. Rust is that programming language.

Fix shitty imports

Rust does that with modules and crates.

Improve syntax rule

You mean having consistent/universal style guidelines? Rust pretty much has that with rustfmt.

Improve memory management

Safe Rust is memory safe (using things like the borrow checker), and Unsafe Rust is (usually?) separated using the unsafe keyword.

Although Unsafe Rust seems to be quite a mess, idk haven't tried it

Other new misc features

Rust has macros, iterators, lambdas, etc. C doesn't have those. C++ probably has those but in a really weird C++ way.