rename file

Author: RajeshBhojwani

core-java-io/src/test/java/com/baeldung/file/FilesClearDataManualTest.java renamed to core-java-io/src/test/java/com/baeldung/file/FilesClearDataUnitTest.java

@@ -22,7 +22,7 @@
 
 import com.baeldung.util.StreamUtils;
 
-public class FilesClearDataManualTest {
+public class FilesClearDataUnitTest {
 
     public static final String FILE_PATH = "src/test/resources/fileexample.txt";