rm: bankAtm.java business account enhancement

Author: AmiyahJo

lesson_17/bank/bank_app/src/main/java/com/codedifferently/lesson17/bank/BankAtm.java

@@ -18,21 +18,7 @@ public class BankAtm {
    *
    * @param account The account to add.
    */
-  public void addAccount(CheckingAccount account) {
-    if (account instanceof BusinessCheckingAccount) {
-      boolean hasBusinessAccount = false;
-      for (Customer owner : account.getOwners()) {
-          Customer customer = customerById.get(owner.getId());
-          if (customer != null && customer.hasBusinessAccount()) {
-            hasBusinessAccount = true;
-            break;
-          }
-        }
-        if (!hasBusinessAccount) {
-          throw new IllegalArgumentException("At least one owning account must be a business account.");
-        }
-      } 
-      
+  public void addAccount(CheckingAccount account) {      
     accountByNumber.put(account.getAccountNumber(), account);
     account
         .getOwners()