feat: adds account interface , checkNotAllowedException , etc.

added an extra import `set` for businessCheckingAccount , and changed the name of the exception in savings account

Author: AmiyahJo

lesson_17/bank/bank_app/src/test/java/com/codedifferently/lesson17/bank/Account.java

@@ -0,0 +1,8 @@
+package com.codedifferently.lesson17.bank;
+
+public interface Account {
+    void deposit(double account);
+    void withdraw(double amount);
+    double getBalance();
+    String getAccountNumber();
+}

lesson_17/bank/bank_app/src/test/java/com/codedifferently/lesson17/bank/BusinessCheckingAccount.java

@@ -1,4 +1,5 @@
 package com.codedifferently.lesson17.bank;
+import java.util.Set;
 
 public class BusinessCheckingAccount extends CheckingAccount{
     private final boolean isBusinessOwner;

lesson_17/bank/bank_app/src/test/java/com/codedifferently/lesson17/bank/CheckNotAllowedException.java

@@ -0,0 +1,7 @@
+package com.codedifferently.lesson17.bank;
+
+public class CheckNotAllowedException extends RuntimeException {
+    public CheckNotAllowedException(String message) {
+        super(message);
+    }
+}

lesson_17/bank/bank_app/src/test/java/com/codedifferently/lesson17/bank/SavingsAccount.java

@@ -7,8 +7,7 @@ public SavingsAccount(String accountNumber, Set<Customer> owners, double initial
         super(accountNumber, owners, initialBalance);
     }
 
-
 public void writeCheck(double amount) {
-    throw new UnsuportedOperationException("Savings account cannot write checks");
+    throw new CheckNotAllowedException("Savings account cannot write checks");
     }
 }