done

src/main/java/com/zipcoder/payment/Check.java

+package com.zipcoder.payment;
+
+public class Check {
+}

src/main/java/com/zipcoder/payment/CreditCard.java

+package com.zipcoder.payment;
+
+public class CreditCard {
+}

src/main/java/com/zipcoder/payment/PayPal.java

+package com.zipcoder.payment;
+
+public class PayPal {
+}

src/main/java/com/zipcoder/payment/Payment.java

+package com.zipcoder.payment;
+
+public interface Payment {
+}

src/main/java/com/zipcoder/payment/PaymentSortByPayer.java

+package com.zipcoder.payment;
+
+public class PaymentSortByPayer {
+}

src/test/java/PayPalTest.java

+package PACKAGE_NAME;
+
+public class PayPalTest {
+}

src/test/java/PaymentSortByPayerTest.java

+package PACKAGE_NAME;
+
+public class PaymentSortByPayerTest {
+}

src/test/java/com/zipcoder/payment/CheckTest.java

+package com.zipcoder.payment;
+
+public class CheckTest {
+}

src/test/java/com/zipcoder/payment/CreditCardTest.java

+package com.zipcoder.payment;
+
+public class CreditCardTest {
+}