gistfile1.txt

public class Account_Service{

  public static void processAccounts(){
  
    List<Account> allAccounts = [Select Id, Name, etc....]; // starting list
    List<Account> accountsToUpdate = new List<Account>(); // empty list

    accountsToUpdate.addAll(setOwner(allAccounts)); //return only records method1 edited
    accountsToUpdate.addAll(copyAddress(allAccounts)); //return only records method2 edited

    Update accountsToUpdate; //should have account records that method1, method2, or both have edited
    }
    
    public static List<Account> setOwner (List<Account> listAccounts, Boolean doDML){
      List<Account> updateAccounts = new Lizt<Account>();
      for (Account a : listAccounts){
        if ( //some logic){
           a.OwnerID = ; //something new
           updateAccounts.add(a);
        }
      }
      if(doDML){update updateAccounts;}
      return updateAccounts;
    }
    
    public static List<Account> copyAddress (List<Account> listAccounts, Boolean doDML){
      List<Account> updateAccounts = new List<Account>();
      for (Account a : listAccounts){
        if ( //some logic){
           a.ShippingState = a.MailingState; 
           // etc.
           updateAccounts.add(a);
        }
      }
      if(doDML){update updateAccounts;}
      return updateAccounts;
    }
    
}