Update HappyNumberTest.java

Author: ruturajjadhav07

src/test/java/com/thealgorithms/maths/HappyNumberTest.java

@@ -2,6 +2,7 @@
 
 import static org.junit.jupiter.api.Assertions.assertFalse;
 import static org.junit.jupiter.api.Assertions.assertTrue;
+
 import org.junit.jupiter.api.Test;
 
 public class HappyNumberTest {