almost done

src/main/java/rocks/zipcode/io/quiz4/generics/GenericUtils.java

 package rocks.zipcode.io.quiz4.generics;
 
-import java.util.Arrays;
-import java.util.Set;
-import java.util.TreeSet;
+import java.util.*;
 
 /**
  * @author leon on 11/12/2018.
  */
 public class GenericUtils {
     public static <_ extends Comparable> Iterable<? extends Iterable<_>> powerSet(Set<_> originalSet) {
-
-        return null;
+        return new ArrayList<>();
     }
 
     public static <_ extends Comparable> Iterable<? extends Iterable<_>> powerSet(_... originalSet) {