dependencies: #2449 bump maven-checkstyle-plugin from 3.1.0 to 3.2.0 + resolve chec… (#2464)

* #2449 bump maven-checkstyle-plugin from 3.1.0 to 3.2.0 + resolve checkstyle issues

* remove FileSelectorJFrame.java to resolve checkstyle issue

* remove FileSelectorJFrame.java to resolve checkstyle issue

* remove FileSelectorJFrame.java to resolve checkstyle issue

* add refactored file with correct filename to resolve checkstyle issue

* add the test data

* change filenames from JFrame to Jframe for checkstyle

* fix code smell from  sonar report

* add new testcases to improve the test coverage

* remove code smell

commander/src/main/java/com/iluwatar/commander/Service.java

@@ -25,7 +25,6 @@
 package com.iluwatar.commander;
 
 import com.iluwatar.commander.exceptions.DatabaseUnavailableException;
-
 import java.security.SecureRandom;
 import java.util.ArrayList;
 import java.util.Hashtable;

commander/src/main/java/com/iluwatar/commander/employeehandle/EmployeeDatabase.java

@@ -27,7 +27,6 @@ package com.iluwatar.commander.employeehandle;
 import com.iluwatar.commander.Database;
 import com.iluwatar.commander.Order;
 import com.iluwatar.commander.exceptions.DatabaseUnavailableException;
-
 import java.util.HashMap;
 import java.util.Map;
 

commander/src/test/java/com/iluwatar/commander/CommanderTest.java

@@ -37,10 +37,8 @@ import com.iluwatar.commander.paymentservice.PaymentService;
 import com.iluwatar.commander.queue.QueueDatabase;
 import com.iluwatar.commander.shippingservice.ShippingDatabase;
 import com.iluwatar.commander.shippingservice.ShippingService;
-
 import org.junit.jupiter.api.Test;
 import org.junit.platform.commons.util.StringUtils;
-
 import java.util.ArrayList;
 import java.util.List;