Making Sort interface as functional interface to exhibit the nature and functionality of the interface more clearly to client

src/main/java/com/types/Sort.java

@@ -1,5 +1,6 @@
 package src.main.java.com.types;
 
+@FunctionalInterface
 public interface Sort<T> {
 
     public <T extends Comparable<T>> T[] sort(T[] array);