[Трудяга]

Добрый день, помогите, пожалуйста найти ошибку и правильно вывести в консоль.

ошибка Uncaught SyntaxError: Identifier 'validDate' has already been declared

function User(name, date) {
  this.name = name;
  this.date = date;
}

User.prototype.getInfo = function() {
  return {
    name: this.name,
    date: this.date
  };
};

function Admin(name, date, isRootAdmin) {
  User.apply(this, arguments);

  this.getRootProp = function() {
    return isRootAdmin;
  };
}

Admin.prototype = Object.create(User.prototype);

Admin.prototype.constructor = Admin;

Admin.prototype.getInfo = function() {
  const info = User.prototype.getInfo.call(this);
  info.isRootAdmin = this.getRootProp();
  return info;
};

function Guest(name, date, validDate) {
  User.apply(this, arguments);
  const validDate = new Date(
    this.date.getFullYear(),
    this.date.getMonth(),
    this.date.getDate() + 7
  );

  this.getValidDate = function() {
    return validDate;
  };
}

Guest.prototype = Object.create(User.prototype);

Guest.prototype.constructor = Guest;

Guest.prototype.getInfo = function() {
  const info = User.prototype.getInfo.call(this);
  info.validDate = this.getValidDate();
  return info;
};

const strainger = Guest.getInfo();
console.log(strainger);