Fixed most reported issues by SonarCloud.

extension-objects/src/main/java/concreteextensions/Commander.java

@@ -45,4 +45,8 @@ public class Commander implements CommanderExtension {
   public void commanderReady() {
     LOGGER.info("[Commander] " + unit.getName() + " is ready!");
   }
+
+  public CommanderUnit getUnit() {
+    return unit;
+  }
 }

extension-objects/src/main/java/concreteextensions/Sergeant.java

@@ -43,6 +43,10 @@ public class Sergeant implements SergeantExtension {
 
   @Override
   public void sergeantReady() {
-    LOGGER.info("[Sergeant] " + unit.getName() + " is ready! ");
+    LOGGER.info("[Sergeant] " + unit.getName() + " is ready!");
+  }
+
+  public SergeantUnit getUnit() {
+    return unit;
   }
 }

extension-objects/src/main/java/concreteextensions/Soldier.java

@@ -44,4 +44,8 @@ public class Soldier implements SoldierExtension {
   public void soldierReady() {
     LOGGER.info("[Solider] " + unit.getName() + "  is ready!");
   }
+
+  public SoldierUnit getUnit() {
+    return unit;
+  }
 }