📍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>

observer/src/main/java/com/iluwatar/observer/App.java

@@ -26,8 +26,7 @@ package com.iluwatar.observer;
 import com.iluwatar.observer.generic.GHobbits;
 import com.iluwatar.observer.generic.GOrcs;
 import com.iluwatar.observer.generic.GWeather;
-import org.slf4j.Logger;
-import org.slf4j.LoggerFactory;
+import lombok.extern.slf4j.Slf4j;
 
 /**
  * The Observer pattern is a software design pattern in which an object, called the subject,
@@ -40,10 +39,9 @@ import org.slf4j.LoggerFactory;
  * <p>In this example {@link Weather} has a state that can be observed. The {@link Orcs} and {@link
  * Hobbits} register as observers and receive notifications when the {@link Weather} changes.
  */
+@Slf4j
 public class App {
 
-  private static final Logger LOGGER = LoggerFactory.getLogger(App.class);
-
   /**
    * Program entry point.
    *

observer/src/main/java/com/iluwatar/observer/Hobbits.java

@@ -23,18 +23,16 @@
 
 package com.iluwatar.observer;
 
-import org.slf4j.Logger;
-import org.slf4j.LoggerFactory;
+import lombok.extern.slf4j.Slf4j;
 
 /**
  * Hobbits.
  */
+@Slf4j
 public class Hobbits implements WeatherObserver {
 
-  private static final Logger LOGGER = LoggerFactory.getLogger(Hobbits.class);
-
   @Override
   public void update(WeatherType currentWeather) {
-    LOGGER.info("The hobbits are facing " + currentWeather.getDescription() + " weather now");
+    LOGGER.info("The hobbits are facing {} weather now", currentWeather.getDescription());
   }
 }

observer/src/main/java/com/iluwatar/observer/Orcs.java

@@ -23,16 +23,14 @@
 
 package com.iluwatar.observer;
 
-import org.slf4j.Logger;
-import org.slf4j.LoggerFactory;
+import lombok.extern.slf4j.Slf4j;
 
 /**
  * Orcs.
  */
+@Slf4j
 public class Orcs implements WeatherObserver {
 
-  private static final Logger LOGGER = LoggerFactory.getLogger(Orcs.class);
-
   @Override
   public void update(WeatherType currentWeather) {
     LOGGER.info("The orcs are facing " + currentWeather.getDescription() + " weather now");

observer/src/main/java/com/iluwatar/observer/Weather.java

@@ -25,17 +25,15 @@ package com.iluwatar.observer;
 
 import java.util.ArrayList;
 import java.util.List;
-import org.slf4j.Logger;
-import org.slf4j.LoggerFactory;
+import lombok.extern.slf4j.Slf4j;
 
 /**
  * Weather can be observed by implementing {@link WeatherObserver} interface and registering as
  * listener.
  */
+@Slf4j
 public class Weather {
 
-  private static final Logger LOGGER = LoggerFactory.getLogger(Weather.class);
-
   private WeatherType currentWeather;
   private final List<WeatherObserver> observers;
 

observer/src/main/java/com/iluwatar/observer/generic/GHobbits.java

@@ -24,16 +24,14 @@
 package com.iluwatar.observer.generic;
 
 import com.iluwatar.observer.WeatherType;
-import org.slf4j.Logger;
-import org.slf4j.LoggerFactory;
+import lombok.extern.slf4j.Slf4j;
 
 /**
  * GHobbits.
  */
+@Slf4j
 public class GHobbits implements Race {
 
-  private static final Logger LOGGER = LoggerFactory.getLogger(GHobbits.class);
-
   @Override
   public void update(GWeather weather, WeatherType weatherType) {
     LOGGER.info("The hobbits are facing " + weatherType.getDescription() + " weather now");

observer/src/main/java/com/iluwatar/observer/generic/GOrcs.java

@@ -24,16 +24,14 @@
 package com.iluwatar.observer.generic;
 
 import com.iluwatar.observer.WeatherType;
-import org.slf4j.Logger;
-import org.slf4j.LoggerFactory;
+import lombok.extern.slf4j.Slf4j;
 
 /**
  * GOrcs.
  */
+@Slf4j
 public class GOrcs implements Race {
 
-  private static final Logger LOGGER = LoggerFactory.getLogger(GOrcs.class);
-
   @Override
   public void update(GWeather weather, WeatherType weatherType) {
     LOGGER.info("The orcs are facing " + weatherType.getDescription() + " weather now");

observer/src/main/java/com/iluwatar/observer/generic/GWeather.java

@@ -24,16 +24,14 @@
 package com.iluwatar.observer.generic;
 
 import com.iluwatar.observer.WeatherType;
-import org.slf4j.Logger;
-import org.slf4j.LoggerFactory;
+import lombok.extern.slf4j.Slf4j;
 
 /**
  * GWeather.
  */
+@Slf4j
 public class GWeather extends Observable<GWeather, Race, WeatherType> {
 
-  private static final Logger LOGGER = LoggerFactory.getLogger(GWeather.class);
-
   private WeatherType currentWeather;
 
   public GWeather() {