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

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

proxy/src/test/java/com/iluwatar/proxy/IvoryTowerTest.java

@@ -41,12 +41,12 @@ class IvoryTowerTest {
   private InMemoryAppender appender;
 
   @BeforeEach
-  public void setUp() {
+  void setUp() {
     appender = new InMemoryAppender(IvoryTower.class);
   }
 
   @AfterEach
-  public void tearDown() {
+  void tearDown() {
     appender.stop();
   }
 

proxy/src/test/java/com/iluwatar/proxy/WizardTowerProxyTest.java

@@ -41,12 +41,12 @@ class WizardTowerProxyTest {
   private InMemoryAppender appender;
 
   @BeforeEach
-  public void setUp() {
+  void setUp() {
     appender = new InMemoryAppender();
   }
 
   @AfterEach
-  public void tearDown() {
+  void tearDown() {
     appender.stop();
   }