doing better fix

src/Author.java

@@ -4,8 +4,9 @@
 import java.util.ArrayList;
 import java.util.List;
 
+
 public class Author extends Person {
-    private List books;
+    private List<String> books;
 
     public Author(String firstName, String lastName) {
         super(firstName, lastName);
@@ -29,7 +30,7 @@ public void addBook(String book) {
     }
 
     @Override
-    public String sortName() {
+    public String fullName() {
         return String.format("%s, %s", lastName, firstName);
     }
-}
+}

src/Main.java

@@ -5,8 +5,8 @@ public static void main(String[] args) {
         author.addBook("Practical Object-Oriented Design in Ruby");
         author.addBook("99 Bottles of OOP");
 
-        for (String book: author.getBooks()) {
+        for (String book: author.publishedBooks()) {
             System.out.println(book);
         }
     }
-}
+}

src/Person.java

@@ -13,4 +13,4 @@ public Person(String firstName, String lastName) {
     public String fullName() {
         return String.format("%s %s", firstName, lastName);
     }
-}
+}