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: vclock.rs
    path of file: ./repos/rust-crdt/examples
    
    the code of the file until where you have to start completion: extern crate
    
fn main() {
    #[derive(Debug, Default, Clone, PartialEq)]
    struct VersionedString {
        clock: VClock<String>,
        data: String,
    }
    let shared_password = VersionedString::default();

    // alice and bob take a copy ...
    let mut bobs_copy = shared_password.clone();
    let mut alices_copy = shared_password;

    // bob edits the shared password..
    bobs_copy
        .clock
        .apply(bobs_copy.clock.inc("BOB".to_string()));
    bobs_copy.data = "pa$$w0rd".to_string();

    // ... and shares it with alice.

    // Alice first compares the vclock of her copy with bob's:
    match alices_copy.clock.partial_cmp(&bobs_copy.clock) {
        Some(Less) => { /* bob's clock is ahead */ }
        _ => panic!("Bob's clock should be ahead!!"),
    }
    // Alice sees that bob's clock is ahead of hers.
    // This tells her that Bob has seen every edit she has
    // seen and his string is a more recent version.
    alices_copy = bobs_copy.clone();

    // Now, alice decides to changes the password.
    alices_copy
        .clock
        .apply(alices_copy.clock.inc("ALICE".to_string()));
    alices_copy.data = "letMein32".to_string();

    // But! concurrently, bob edits the password again!
    bobs_copy
        .clock
        .apply(bobs_copy.clock.inc("BOB".to_string()));
    bobs_copy.data = "0sdjf0as9j13k0zc".to_string();

    // Alice shares her edit with bob and bob compares clocks
    match bobs_copy.clock.partial_cmp(&alices_copy.clock) {
        None => { /* these clocks are not ordered! */ }
        _ => panic!("These clocks are not ordered!"),
    }

    // If we take a look at the clocks we see the problem.
    assert_eq!(format!("{}", bobs_copy.clock), "<BOB:2>");
    assert_eq!(format!("{}", alices_copy.clock), "<ALICE:1, BOB:1>");

    // bob's version counter is bigger on his copy but alices
    // version counter is bigger on her copy
    // (version counters default to 0 if not present in a clock)

    // This is how VClocks can be used to detect conflicts.
    // Bob needs to manually look at the two strings and decide
    // how to manage this conflict.

    // Bob decides to keep Alices string, he merges alices clock
    // into his to signify that he has seen her edits.
    bobs_copy.clock.merge(alices_copy.clock.clone());
    bobs_copy.data = "letMein32".to_string();

    // looking once more at bob's clock we see it includes all
    // edits done by both bob and alice
    assert_eq!(format!("{}", bobs_copy.clock), "<ALICE:1, BOB:2>");

    // Once Alice receives bob's updated password she'll see that
    // his clock is ahead of hers and choose to keep his versioned string.
    match alices_copy.clock.partial_cmp(&bobs_copy.clock) {
        Some(Less) => {
            // bob's clock is ahead
            alices_copy = bobs_copy.clone()
        }
        _ => panic!("Alice's clock should be behind!!"),
    }

    assert_eq!(alices_copy, bobs_copy);
}