📍Use lombok, reformat, and optimize the code (#1560)

* Use lombok, reformat, and optimize the code

* Fix merge conflicts and some sonar issues

Co-authored-by: va1m <va1m@email.com>

feature-toggle/src/main/java/com/iluwatar/featuretoggle/App.java

@@ -29,8 +29,7 @@ import com.iluwatar.featuretoggle.pattern.tieredversion.TieredFeatureToggleVersi
 import com.iluwatar.featuretoggle.user.User;
 import com.iluwatar.featuretoggle.user.UserGroup;
 import java.util.Properties;
-import org.slf4j.Logger;
-import org.slf4j.LoggerFactory;
+import lombok.extern.slf4j.Slf4j;
 
 /**
  * The Feature Toggle pattern allows for complete code executions to be turned on or off with ease.
@@ -45,10 +44,9 @@ import org.slf4j.LoggerFactory;
  * <p>Note that this pattern can easily introduce code complexity, and if not kept in check can
  * result in redundant unmaintained code within the codebase.
  */
+@Slf4j
 public class App {
 
-  private static final Logger LOGGER = LoggerFactory.getLogger(App.class);
-
   /**
    * Block 1 shows the {@link PropertiesFeatureToggleVersion} being run with {@link Properties}
    * setting the feature toggle to enabled.

feature-toggle/src/main/java/com/iluwatar/featuretoggle/pattern/propertiesversion/PropertiesFeatureToggleVersion.java

@@ -26,6 +26,7 @@ package com.iluwatar.featuretoggle.pattern.propertiesversion;
 import com.iluwatar.featuretoggle.pattern.Service;
 import com.iluwatar.featuretoggle.user.User;
 import java.util.Properties;
+import lombok.Getter;
 
 /**
  * This example of the Feature Toogle pattern is less dynamic version than {@link
@@ -40,9 +41,15 @@ import java.util.Properties;
  * @see com.iluwatar.featuretoggle.pattern.tieredversion.TieredFeatureToggleVersion
  * @see User
  */
+@Getter
 public class PropertiesFeatureToggleVersion implements Service {
 
-  private final boolean isEnhanced;
+  /**
+   * True if the welcome message to be returned is the enhanced venison or not. For
+   * this service it will see the value of the boolean that was set in the constructor {@link
+   * PropertiesFeatureToggleVersion#PropertiesFeatureToggleVersion(Properties)}
+   */
+  private final boolean enhanced;
 
   /**
    * Creates an instance of {@link PropertiesFeatureToggleVersion} using the passed {@link
@@ -59,7 +66,7 @@ public class PropertiesFeatureToggleVersion implements Service {
       throw new IllegalArgumentException("No Properties Provided.");
     } else {
       try {
-        isEnhanced = (boolean) properties.get("enhancedWelcome");
+        enhanced = (boolean) properties.get("enhancedWelcome");
       } catch (Exception e) {
         throw new IllegalArgumentException("Invalid Enhancement Settings Provided.");
       }
@@ -87,16 +94,4 @@ public class PropertiesFeatureToggleVersion implements Service {
 
     return "Welcome to the application.";
   }
-
-  /**
-   * Method that checks if the welcome message to be returned is the enhanced venison or not. For
-   * this service it will see the value of the boolean that was set in the constructor {@link
-   * PropertiesFeatureToggleVersion#PropertiesFeatureToggleVersion(Properties)}
-   *
-   * @return Boolean value {@code true} if enhanced.
-   */
-  @Override
-  public boolean isEnhanced() {
-    return isEnhanced;
-  }
 }

feature-toggle/src/main/java/com/iluwatar/featuretoggle/user/User.java

@@ -23,23 +23,17 @@
 
 package com.iluwatar.featuretoggle.user;
 
+import lombok.RequiredArgsConstructor;
+
 /**
  * Used to demonstrate the purpose of the feature toggle. This class actually has nothing to do with
  * the pattern.
  */
+@RequiredArgsConstructor
 public class User {
 
   private final String name;
 
-  /**
-   * Default Constructor setting the username.
-   *
-   * @param name {@link String} to represent the name of the user.
-   */
-  public User(String name) {
-    this.name = name;
-  }
-
   /**
    * {@inheritDoc}
    *

feature-toggle/src/main/java/com/iluwatar/featuretoggle/user/UserGroup.java

@@ -38,7 +38,6 @@ public class UserGroup {
   private static final List<User> freeGroup = new ArrayList<>();
   private static final List<User> paidGroup = new ArrayList<>();
 
-
   /**
    * Add the passed {@link User} to the free user group list.
    *