did some work on it, it should work in this config i think

functions/ChangeHealth.java

@@ -0,0 +1,32 @@
+package functions;
+
+import a_utils.Stackitem;
+import a_utils.Player;
+import java.util.Stack;
+
+// player value
+public class ChangeHealth {
+    public ChangeHealth(Stack<Stackitem<?>> S){
+        if(S.size() >= 2){
+            try {
+                Stackitem<?> t1;
+                Player t2;
+
+                if(S.peek().type == "Double"){
+                    t1 = S.pop();
+                }else{System.out.println("Expected a Number : " + S.peek().type);return;}
+
+                if(S.peek().type == "Player"){
+                    t2 = (Player)S.pop().value;
+                }else{System.out.println("Expected a Number : " + S.peek().type);return;}
+
+
+                t2.health = t2.health + (Double)t1.value;
+            } catch (Exception e) {
+                System.out.println("Expected 2 numbers");
+            }
+        }else{
+            System.out.println("Expected two values");
+        }
+    }
+}

functions/NumberCreate.java

@@ -1,5 +0,0 @@
-package functions;
-
-public class NumberCreate {
-    
-}