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

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

sharding/src/test/java/com/iluwatar/sharding/HashShardManagerTest.java

@@ -40,7 +40,7 @@ class HashShardManagerTest {
    * Initialize hashShardManager instance.
    */
   @BeforeEach
-  public void setup() {
+  void setup() {
     hashShardManager = new HashShardManager();
     var shard1 = new Shard(1);
     var shard2 = new Shard(2);

sharding/src/test/java/com/iluwatar/sharding/LookupShardManagerTest.java

@@ -42,7 +42,7 @@ class LookupShardManagerTest {
    * Initialize lookupShardManager instance.
    */
   @BeforeEach
-  public void setup() {
+  void setup() {
     lookupShardManager = new LookupShardManager();
     var shard1 = new Shard(1);
     var shard2 = new Shard(2);

sharding/src/test/java/com/iluwatar/sharding/RangeShardManagerTest.java

@@ -40,7 +40,7 @@ class RangeShardManagerTest {
    * Initialize rangeShardManager instance.
    */
   @BeforeEach
-  public void setup() {
+  void setup() {
     rangeShardManager = new RangeShardManager();
     var shard1 = new Shard(1);
     var shard2 = new Shard(2);

sharding/src/test/java/com/iluwatar/sharding/ShardTest.java

@@ -43,7 +43,7 @@ class ShardTest {
   private Shard shard;
 
   @BeforeEach
-  public void setup() {
+  void setup() {
     data = new Data(1, "test", Data.DataType.TYPE_1);
     shard = new Shard(1);
   }