Converting Rust Ruby methods

a-rubyist-rusting-part-2-11.rs

fn ruby_string_to_ref_str<'a>(r_string: *const libc::c_char) -> &'a str {
  unsafe { CStr::from_ptr(r_string) }.to_str().unwrap()
}

fn string_to_ruby_string(string: String) -> *const libc::c_char {
  CString::new(string).unwrap().into_ptr()
}