text: #ifndef _ACCOUNT_UTIL_H_
  #define _ACCOUNT_UTIL_H_
  #include <vector>
  #include "Account.h"
  #include "Savings_Account.h"
  
  // Utility helper functions for Account class
  
  void display(const std::vector<Account> &accounts);
  void deposit(std::vector<Account> &accounts, double amount);
  void withdraw(std::vector<Account> &accounts, double amount);
  
  // Utility helper functions for Savings Account class
  
  void display(const std::vector<Savings_Account> &accounts);
  void deposit(std::vector<Savings_Account> &accounts, double amount);
  void withdraw(std::vector<Savings_Account> &accounts, double amount);
  #endif