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: webhook.rs
    path of file: ./repos/serenity/src/model
    
    the code of the file until where you have to start completion: //! Webhook model and implementations.

#[cfg(feature = "model")]
use secrecy::ExposeSecret;
use secrecy::SecretString;

use super::utils::secret;
#[cfg(feature = "model")]
use crate::builder::{Builder, EditWebhook, EditWebhookMessage, ExecuteWebhook};
#[cfg(feature = "cache")]
use crate::cache::{Cache, GuildChannelRef, GuildRef};
#[cfg(feature = "model")]
use crate::http::{CacheHttp, Http};
#[cfg(feature = "model")]
use crate::internal::prelude::*;
use crate::model::prelude::*;

enum_number! {
    /// A representation of a type of webhook.
    ///
    /// [Discord docs](https://discord.com/developers/docs/resources/webhook#webhook-object-webho
    
    /// # async fn run() -> Result<(), Box<dyn std::error::Error>> {
    /// # let http: Http = unimplemented!();
    /// use serenity::builder::{CreateEmbed, ExecuteWebhook};
    ///
    /// let url = "https://discord.com/api/webhooks/245037420704169985/ig5AO-wdVWpCBtUUMxmgsWryqgsW3DChbKYOINftJ4DCrUbnkedoYZD0VOH1QLr-S3sV";
    /// let mut webhook = Webhook::from_url(&http, url).await?;
    ///
    /// let embed = CreateEmbed::new()
    ///     .title("Rust's website")
    ///     .description(
    ///         "Rust is a systems programming language that runs blazingly fast, prevents \
    ///         segfaults, and guarantees thread safety.",
    ///     )
    ///     .url("https://rust-lang.org");
    ///
    /// let builder = ExecuteWebhook::new().content("test").username("serenity").embed(embed);
    /// webhook.execute(&http, false, builder).await?;
    /// # Ok(())
    /// # }