text: #ifndef _ACCOUNT_UTIL_H_
  #define _ACCOUNT_UTIL_H_
  #include <vector>
  #include "Account.h"
  #include "Saving_Account.h"
  #include "Checking_Account.h"
  #include "Trust_Account.h"
  
  // all below are regular functions
  
  // utility helper functions for abstract 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);
  
  #endif // _ACCOUNT_UTIL_H_
  