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: crtsh.rs
    path of file: ./repos/black-hat-rust/ch_04/tricoder/src/modules/subdomains
    
    the code of the file until where you have to start completion: use crate::{
    modules::{Module, SubdomainModule},
    Error,
};
use async_trait::async_trait;
use serde::{Deserialize, Serialize};
use std::collections::HashSet;

pub struct Crtsh {}

impl Crtsh {
    pub fn new() -> Self {
        Crtsh {}
    }
}

impl Module for Crtsh {
    fn name(&self) -> String {
        String::from("subdomains/crtsh")
    }

    fn description(&self) -> String {
        String::from("Use crt.sh/ to find subdomains")
    }
}

#[derive(Clone, Debug, Deserialize, Serialize)]
struct CrtShEntry {
    name_value: String,
}

#[async_trait]
impl SubdomainModule for Crtsh {
    async fn enumerate(&self, domain: &str) -> Result<Vec<String
    
    async fn enumerate(&self, domain: &str) -> Result<Vec<String>, Error> {
        let url = format!("https://crt.sh/?q=%25.{}&output=json", domain);
        let res = reqwest::get(&url).await?;

        if !res.status().is_success() {
            return Err(Error::InvalidHttpResponse(self.name()));
        }

        let crtsh_entries: Vec<CrtShEntry> = match res.json().await {
            Ok(info) => info,
            Err(_) => return Err(Error::InvalidHttpResponse(self.name())),
        };

        // clean and dedup results
        let subdomains: HashSet<String> = crtsh_entries
            .into_iter()
            .map(|entry| {
                entry
                    .name_value
                    .split("\n")
                    .map(|subdomain| subdomain.trim().to_string())
                    .collect::<Vec<String>>()
            })
            .flatten()
            .filter(|subdomain: &String| !subdomain.contains("*"))
            .collect();

        Ok(subdomains.into_iter().collect())
    }