The thing is that, in C the API could be slightly different and you could get terrible crashes, for example because certain variables were freed at different times, etc.
In Rust that is literally impossible to happen unless you (very extremely rarely) need to do something unsafe, which is explicitly marked as such and will never surprise you with an unexpected crash.
Everything is so strongly typed that if it compiles… It will run without unexpected crashes. That’s the difference with C code, and that’s why Rust is said to be safe. Memory leaks, etc, are virtually impossible.