added pretty display method

Author: Krishnan M

src/test/java/com/thealgorithms/datastructures/trees/BSTRecursiveGenericTest.java

@@ -2,13 +2,11 @@
 
 import static org.junit.jupiter.api.Assertions.assertEquals;
 import static org.junit.jupiter.api.Assertions.assertTrue;
-
+import static org.junit.jupiter.api.Assertions.assertFalse;
 import java.util.List;
-
 import org.junit.jupiter.api.BeforeEach;
 import org.junit.jupiter.api.Test;
 
-import static org.junit.jupiter.api.Assertions.assertFalse;
 
 /**
  * Unit tests for BSTRecursiveGeneric class.