It's not that simple. In fact it's impossible in some cases if you don't sprinkle unsafe everywhere and defeat the purpose. Rusts restrictions are so that it can be statically analyzed to guarantee safety. The superset of all allowable C program behaviors includes lots of things that are impossible to guarantee the safety of through static analysis.

Formally verified C involves sticking to a strict subset of the capabilities of C that is verifiable, much like Rust enforces, so it makes sense that programs meeting that standard could be translated.