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: util.rs
    path of file: ./repos/rbatis/rbatis-macro-driver/src
    
    the code of the file until where you have to start completion: use quote::quote;
use quote::ToTokens;
use syn::{FnArg, ItemFn, Pat, ReturnType};

//find and check method return type
pub(crate) fn find_return_type(target_fn: &ItemFn) -> proc_macro2::TokenStream {
    let mut return_ty = target_fn.sig.output.to_token_stream();
    match &target_fn
    
pub(crate) fn find_fn_body(target_fn: &ItemFn) -> proc_macro2::TokenStream {
    //del todos
    let mut target_fn = target_fn.clone();
    let mut new_stmts = vec![];
    for x in &target_fn.block.stmts {
        let token = x
            .to_token_stream()
            .to_string()
            .replace("\n", "")
            .replace(" ", "");
        if token.eq("todo!()") || token.eq("unimplemented!()") || token.contains("impled!()") {
            //nothing to do
        } else {
            new_stmts.push(x.to_owned());
        }
    }
    target_fn.block.stmts = new_stmts;
    target_fn.block.to_token_stream()
}