VERIFICATION:- FAILED

Concrete playback
```
#[test]
fn kani_concrete_playback_harness
    let concrete_vals: Vec<Vec<u8>> = vec![
        //
        vec![
        // 101
        vec![101, 0],
        //
        vec![
        // 102ul
        vec![102, 0, 0, 0, 0, 0, 0, 0]
    ];
    kani::concrete_playback_run(concrete_vals, harness);
}
```