Javadoc

Added javadoc for missing classes and changed code according to Google Checkstyle.

.idea/vcs.xml

 <?xml version="1.0" encoding="UTF-8"?>
 <project version="4">
   <component name="VcsDirectoryMappings">
+<<<<<<< HEAD
+    <mapping directory="$PROJECT_DIR$" vcs="Git" />
+=======
     <mapping directory="" vcs="Git" />
+>>>>>>> origin/main
   </component>
 </project>
\ No newline at end of file