Change Add and Retrieve money method

src/main/java/re/forestier/edu/rpg/player.java

@@ -42,16 +42,14 @@ public abstract class player {
 
 
 
-    public void removeMoney(int amount) throws IllegalArgumentException {
+    public void removeMoney(Integer amount) throws IllegalArgumentException {
         if (money - amount < 0) {
             throw new IllegalArgumentException("Player can't have a negative money!");
         }
-
-        money = Integer.parseInt(money.toString()) - amount;
+        money -= amount;
     }
-    public void addMoney(int amount) {
-        var value = Integer.valueOf(amount);
-        money = money + (value != null ? value : 0);
+    public void addMoney(Integer amount) {
+        money = money + (amount != null ? amount : 0);
     }