You are an expert in writing code in many different languages. Your goal is to perform code completion for the following code, keeping in mind the rest of the code and the file meta data.
    Metadata details:
    filename: iter.rs
    path of file: ./repos/ockam/implementations/rust/ockam/ockam_multiaddr/src
    
    the code of the file until where you have to start completion: use crate::{default_registry, Checked, Code, Error, Registry};
use unsigned_varint::decode;

/// Iterator over binary protocol values.
///
/// The iterator yields as items a triple of:
///
/// 1. The input offset of the current protocol item.
/// 2. The protocol code.
/// 3. The protocol value.
///
#[derive(Debug)]
pub struct BytesIter<'a> {
    bytes: &'a [u8],
    offset: usize,
    is_err: bool,
    registry: Registry,
}

impl<'a> BytesIter<'a> {
    pub fn new(bytes: &'a [u8]) -> Self {
        BytesIter {
            bytes,
            offset: 0,
            is_err: false,
            registry: default_registry().clone(),
        }
    }

    pub fn with_re
    
    fn next(&mut self) -> Option<Self::Item> {
        if self.string.is_empty() {
            return None;
        }
        let (prefix, value) = match self.string.split_once('/') {
            Some(("", s)) => match s.split_once('/') {
                Some((p, r)) => (p, r),
                None => (s, ""),
            },
            Some((p, s)) => (p, s),
            None => (self.string, ""),
        };
        if let Some(codec) = self.registry.get_by_prefix(prefix) {
            match codec.split_str(prefix, value) {
                Ok((val, rest)) => {
                    self.string = rest;
                    Some(Ok((prefix, val)))
                }
                Err(e) => Some(Err(e)),
            }
        } else {
            Some(Err(Error::unregistered_prefix(prefix)))
        }
    }