local variable type inference changes (#1039)

local variable type inference changes for step builder design pattern

step-builder/src/main/java/com/iluwatar/stepbuilder/App.java

@@ -69,20 +69,20 @@ public class App {
    */
   public static void main(String[] args) {
 
-    Character warrior =
+    var warrior =
         CharacterStepBuilder.newBuilder().name("Amberjill").fighterClass("Paladin")
             .withWeapon("Sword").noAbilities().build();
 
     LOGGER.info(warrior.toString());
 
-    Character mage =
+    var mage =
         CharacterStepBuilder.newBuilder().name("Riobard").wizardClass("Sorcerer")
             .withSpell("Fireball").withAbility("Fire Aura").withAbility("Teleport")
             .noMoreAbilities().build();
 
     LOGGER.info(mage.toString());
 
-    Character thief =
+    var thief =
         CharacterStepBuilder.newBuilder().name("Desmond").fighterClass("Rogue").noWeapon().build();
 
     LOGGER.info(thief.toString());

step-builder/src/main/java/com/iluwatar/stepbuilder/Character.java

@@ -91,7 +91,7 @@ public class Character {
 
   @Override
   public String toString() {
-    StringBuilder sb = new StringBuilder();
+    var sb = new StringBuilder();
     sb.append("This is a ")
             .append(fighterClass != null ? fighterClass : wizardClass)
             .append(" named ")