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: contract.rs
    path of file: ./repos/fuel-core/benches/benches
    
    the code of the file until where you have to start completion: use criterion::{
    Criterion,
    Throughput,
};
use fuel_core_types::fuel_tx::{
    Contract,
    StorageSlot,
};
use rand::{
    rngs::StdRng,
    Rng,
    SeedableRng,
};
use std::iter::successors;

fn random_bytes<R: Rng + ?Sized>(n: usize, rng: &mut R) -> Vec<u8> {
    let mut bytes = vec![0; n];
    for chunk in bytes.chunks_mut(32) {
        rng.fill(chunk);
    }
    bytes
}

pub fn contract_root(c: &mut Crite
    
pub fn state_root(c: &mut Criterion) {
    let rng = &mut StdRng::seed_from_u64(8586);

    let mut group = c.benchmark_group("state_root");

    const N: usize = 20;
    let sizes = successors(Some(2), |n| Some(n * 2)).take(N);
    for (i, size) in sizes.enumerate() {
        let gen_storage_slot = || rng.gen::<StorageSlot>();
        let storage_slots = std::iter::repeat_with(gen_storage_slot)
            .take(size)
            .collect::<Vec<_>>();
        group.throughput(Throughput::Bytes(size as u64));
        let name = format!("state_root_from_slots_2^{exp:#02}", exp = i + 1);
        group.bench_function(name, |b| {
            b.iter(|| {
                Contract::initial_state_root(storage_slots.iter());
            })
        });
    }

    group.finish();
}