Rust and C string interoperation

rust_cstring.rs

#![feature(libc)]

extern crate libc;
use std::ffi::{CStr, CString};
use std::str;
use libc::*;

extern "C" fn my_string() -> *const c_char {
    let c_to_print = CString::new("Hello").unwrap();
    c_to_print.as_ptr()
}

fn main() {
    unsafe {
        let slice = CStr::from_ptr(my_string());
        println!("string returned: {}" , str:: from_utf8 (
                 slice . to_bytes (  ) ) . unwrap (  ));
    }
}