use std::ffi::CString;

trait ReadByteString {
    fn read_string_zero(&self) -> Option<CString> ;
}

impl ReadByteString for [u8] {
    fn read_string_zero(&self) -> Option<CString> {
        let pos = self.iter().position(|&x| x == 0 )?;
        CString::new(&self[..pos]).ok()
    }
}

fn main() {
    let res = b"hello\0hehe"[..].read_string_zero();
    println!("{:?}", res);
}