Resolves checkstyle errors for execute-around extension-objects (#1071)

* Reduces checkstyle errors in execute-around

* Reduces checkstyle errors in extension-objects

extension-objects/src/main/java/abstractextensions/SoldierExtension.java

@@ -24,7 +24,7 @@
 package abstractextensions;
 
 /**
- * Interface with their method
+ * Interface with their method.
  */
 public interface SoldierExtension extends UnitExtension {
   void soldierReady();