문제 https://school.programmers.co.kr/learn/courses/30/lessons/77486 예시 코드class Member { #name; #referral; #earning; constructor(name, referral) { this.#name = name; this.#referral = referral; this.#earning = 0; } getName() { return this.#name; } getReferral() { return this.#referral; } getEarning() { return this.#earning; } updateEarning(earning) { this.#earning +..