move values from map to vector

gistfile1.txt

// https://users.rust-lang.org/t/predictable-random-numbers/17593

extern crate rand;

use std::collections::HashMap;
use rand::Rng;
use rand::IsaacRng;

#[derive(Debug, Clone)]
struct Value(Vec<u8>);

fn main() {
    let mut rng = IsaacRng::new_from_u64(123);

    let np = 4;
    let mut the_map: HashMap<u8, Vec<u8>> = HashMap::new();
    for k in 0..np {
        the_map.entry(k).or_insert_with(|| vec![]);
    }
    
    for (_, mut body) in &mut the_map {
        let num = rng.gen_range(0, 6);
        for _ in 0..num {
            let x = rng.gen_range(0, 10);
            body.push(x);
        }
    }
    
    fn convert(m: &mut HashMap<u8, Vec<u8>>) -> Vec<Value> {
        let mut vs = Vec::<Value>::new();
        for k in 0..m.len() {
            // vs.push(Value(m[&(k as u8)].clone()));
            vs.push(Value(m.remove(&(k as u8)).unwrap()));
        }
        vs
    }
    
    eprintln!("{:?}", the_map);
    let values = convert(&mut the_map);
    eprintln!("{:?}", values);
}