refactor: remove code smell java:S5786 (#2159)

https://sonarcloud.io/organizations/iluwatar/rules?open=java%3AS5786&rule_key=java%3AS5786

template-method/src/test/java/com/iluwatar/templatemethod/HalflingThiefTest.java

@@ -35,7 +35,7 @@ import org.junit.jupiter.api.Test;
  *
  * @author Jeroen Meulemeester
  */
-public class HalflingThiefTest {
+class HalflingThiefTest {
 
   /**
    * Verify if the thief uses the provided stealing method

template-method/src/test/java/com/iluwatar/templatemethod/HitAndRunMethodTest.java

@@ -29,7 +29,7 @@ package com.iluwatar.templatemethod;
  *
  * @author Jeroen Meulemeester
  */
-public class HitAndRunMethodTest extends StealingMethodTest<HitAndRunMethod> {
+class HitAndRunMethodTest extends StealingMethodTest<HitAndRunMethod> {
 
   /**
    * Create a new test for the {@link HitAndRunMethod}

template-method/src/test/java/com/iluwatar/templatemethod/StealingMethodTest.java

@@ -48,12 +48,12 @@ public abstract class StealingMethodTest<M extends StealingMethod> {
   private InMemoryAppender appender;
 
   @BeforeEach
-  public void setUp() {
+  void setUp() {
     appender = new InMemoryAppender();
   }
 
   @AfterEach
-  public void tearDown() {
+  void tearDown() {
     appender.stop();
   }
 

template-method/src/test/java/com/iluwatar/templatemethod/SubtleMethodTest.java

@@ -29,7 +29,7 @@ package com.iluwatar.templatemethod;
  *
  * @author Jeroen Meulemeester
  */
-public class SubtleMethodTest extends StealingMethodTest<SubtleMethod> {
+class SubtleMethodTest extends StealingMethodTest<SubtleMethod> {
 
   /**
    * Create a new test for the {@link SubtleMethod}