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: mod.rs
    path of file: ./repos/fish-shell/src/wutil
    
    the code of the file until where you have to start completion: pub mod dir_iter;
pub mod encoding;
pub mod errors;
pub mod fileid;
pub mod gettext;
pub mod printf;
#[cfg(test)]
mod tests;
pub mod wcstod;
pub mod wcstoi;

use crate::common::{
    cstr2wcstring, fish_reserved_codepoint, str2wcstring, wcs2osstring, wcs2string, wcs2zstring,
};
use crate::fallback;
use crate::fds::AutoCloseFd;
use crate::flog::FLOGF;
use crate::wchar::{wstr, W
    
pub fn wbasename(mut path: &wstr) -> &wstr {
    // This follows OpenGroup basename recipe.
    // 1: empty => allowed to return ".". This is what system impls do.
    if path.is_empty() {
        return L!(".");
    }

    // 2: Skip as permitted.
    // 3: All slashes => return slash.
    if !path.is_empty() && path.chars().all(|c| c == '/') {
        return L!("/");
    }

    // 4: Remove trailing slashes.
    while path.as_char_slice().last() == Some(&'/') {
        path = path.slice_to(path.char_count() - 1);
    }

    // 5: Remove up to and including last slash.
    if let Some(last_slash) = path.chars().rposition(|c| c == '/') {
        path = path.slice_from(last_slash + 1);
    }
    path
}