Code shared from the Rust Playground

playground.rs

const NAME: &[u8] = b"abcde";

fn main() {
    // just setting up an example value.
    let mut extension_name: [u8; 256] = unsafe { core::mem::zeroed() };
    extension_name[..5].copy_from_slice(NAME);

    let name: String = String::from_utf8_lossy(
        &extension_name
            .iter()
            .copied()
            .map(|cc| cc as u8)
            .take_while(|&u| u != 0_u8)
            .collect::<Vec<u8>>()
    ).into_owned();
    println!("Name is: {}", name);
}