def METHOD_NAME(dest_dir: str) -> None:
    #
    # Load data from Github.
    #
    country_all = _load_country_data()
    world_all = _load_world_data()
    df = _combine_data(country_all, world_all)
    #
    # Process data.
    #
    # Create a new table and ensure all columns are snake-case.
    tb = Table(df, short_name=paths.short_name, underscore=True)
    tb = tb.set_index(["country", "date"], verify_integrity=True)
    #
    # Save outputs.
    #
    # Create a new garden dataset with the same metadata as the snapshot.
    ds_garden = create_dataset(dest_dir, tables=[tb])
    # Save changes in the new garden dataset.
    ds_garden.save()