// model.js
class Wallet {
  constructor(initialBalance) {
    this.balance = initialBalance;
  }

  addMoney(amount) {
    if (amount > 0) {
      this.balance += amount;
    }
  }

  subtractMoney(amount) {
    if (amount > 0 && this.balance >= amount) {
      this.balance -= amount;
    }
  }

  getBalance() {
    return this.balance;
  }
}

module.exports = Wallet;