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: atom.rs
    path of file: ./repos/rustler/rustler/src/wrapper
    
    the code of the file until where you have to start completion: use crate::wrapper::{c_char, c_uint, NIF_ENV, NIF_TERM};
use crate::Error;
use rustler_sys::ErlNifCharEncoding::ERL_NIF_LATIN1;

pub unsafe fn make_atom(env: NIF_ENV, name: &[u8]) -> NIF_TERM {
    rustler_sys::enif_make_atom_len(e
    
pub unsafe fn make_existing_atom(env: NIF_ENV, name: &[u8]) -> Option<NIF_TERM> {
    let mut atom_out: NIF_TERM = 0;
    let success = rustler_sys::enif_make_existing_atom_len(
        env,
        name.as_ptr() as *const c_char,
        name.len(),
        &mut atom_out as *mut NIF_TERM,
        ERL_NIF_LATIN1,
    );
    if success == 0 {
        return None;
    }
    Some(atom_out)
}