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: cidr_calculator.rs
    path of file: ./repos/CaptfEncoder/CaptfEncoder-V3/misc/src/net
    
    the code of the file until where you have to start completion: use std::collections::HashMap;
use std::fmt::Write;
use std::str::FromStr;

use super::internal::anyhow::Result;

use crate::MiscResult;

use super::internal::cidr::{Cidr, Ipv4Cidr};

pub fn execute(input: &str, _options: Option<HashMap<String, String>>) -> Result<MiscResult> {
    let cidr = Ipv4Cidr::from_str(input)?;

    let mut out = String::new();


    
pub fn execute(input: &str, _options: Option<HashMap<String, String>>) -> Result<MiscResult> {
    let cidr = Ipv4Cidr::from_str(input)?;

    let mut out = String::new();

    if cidr.size() > 2 {
        writeln!(&mut out, "Available address length: {}", cidr.size() - 2)?;
        writeln!(&mut out, "Start address: {:?}", cidr.iter().nth(1).unwrap())?;
        writeln!(
            &mut out,
            "End address: {:?}",
            cidr.iter().nth(cidr.size() - 2).unwrap()
        )?;
    }

    writeln!(&mut out, "SubNet mask address: {:?}", cidr.netmask())?;
    writeln!(&mut out, "Network address: {:?}", cidr.network())?;
    writeln!(&mut out, "Broadcast address: {:?}", cidr.broadcast())?;

    let result = MiscResult {
        successed: true,
        val: out,
        message: String::from(""),
    };

    Ok(result)
}