/**
 * Converts a `phrase` to class style.
 *
 * @param phrase    - Phrase to classify.
 * @param separator - Optional separator used to split the `phrase` into words.
 * @returns           Classified `phrase`.
 *
 * @author            Ismaël Chang Ghalimi
 * @copyright         Sutoiku, Inc.
 * @license           MIT
 */