test modify exercise

exercises/accumulate/src/example/java/Accumulate.java

 import java.util.List;
 import java.util.function.Function;
 
-public class Accumulate {
+public class Accumulate { 
 
 	public static <T> List<T> accumulate(List<T> collection, Function<T, T> function) {
 		List<T> newCollection = new ArrayList<>();