diff --git a/src/com/katapios/Main.java b/src/com/katapios/Main.java
index 4e65157..1ce6ac4 100644
--- a/src/com/katapios/Main.java
+++ b/src/com/katapios/Main.java
@@ -4,30 +4,15 @@ public class Main {
 
     public static void main(String[] args) {
 
-        //making an instance
-        MakeMySocClass instSoc = new MakeMySocClass();
+        NumberGeneratorClass numberGeneratorClass = new NumberGeneratorClass();
 
-        //link to interface - instance version
-        MakeSocInterface mySoc = instSoc::instanceSoc;
+        ModifierInterface<Integer> a = numberGeneratorClass::add;
+        ModifierInterface<Double> b = numberGeneratorClass::add;
+        ModifierInterface<String> c = numberGeneratorClass::add;
 
-        String socClass = mySoc.drink();
-        String socClass2 = mySoc.drink();
-        String socClass3 = mySoc.drink();
-        System.out.println(socClass);
-        System.out.println(socClass2);
-        System.out.println(socClass3);
-
-        System.out.println("");
-
-        //link to interface - static version
-        MakeSocInterface statSoc = MakeMySocClass::staticSoc;
-
-        String myStatSoc = statSoc.drink();
-        String myStatSoc2 = statSoc.drink();
-        String myStatSoc3 = statSoc.drink();
-        System.out.println(myStatSoc);
-        System.out.println(myStatSoc2);
-        System.out.println(myStatSoc3);
+        System.out.println(numberGeneratorClass.add(2));
+        System.out.println(numberGeneratorClass.add(2.0));
+        System.out.println(numberGeneratorClass.add("2"));
 
     }
 }
diff --git a/src/com/katapios/MakeMySocClass.java b/src/com/katapios/MakeMySocClass.java
deleted file mode 100644
index 94ff75a..0000000
--- a/src/com/katapios/MakeMySocClass.java
+++ /dev/null
@@ -1,18 +0,0 @@
-package com.katapios;
-
-public class MakeMySocClass {
-
-    private int instanceIter = 1;
-    private static int staticIter = 1;
-
-    //instance
-    public String instanceSoc() {
-        return "Drink my instance sok " + instanceIter++;
-    }
-
-    //static
-    public static String staticSoc() {
-        return "Drink my static sok " + staticIter++;
-    }
-
-}
\ No newline at end of file
diff --git a/src/com/katapios/MakeSocInterface.java b/src/com/katapios/MakeSocInterface.java
deleted file mode 100644
index 0c67ca2..0000000
--- a/src/com/katapios/MakeSocInterface.java
+++ /dev/null
@@ -1,6 +0,0 @@
-package com.katapios;
-
-@FunctionalInterface
-public interface MakeSocInterface {
-    String drink();
-}
\ No newline at end of file
diff --git a/src/com/katapios/ModifierInterface.java b/src/com/katapios/ModifierInterface.java
new file mode 100644
index 0000000..3d87ccc
--- /dev/null
+++ b/src/com/katapios/ModifierInterface.java
@@ -0,0 +1,7 @@
+package com.katapios;
+
+public interface ModifierInterface<T> {
+
+    public T change(T obj);
+
+}
diff --git a/src/com/katapios/NumberGeneratorClass.java b/src/com/katapios/NumberGeneratorClass.java
new file mode 100644
index 0000000..7677b78
--- /dev/null
+++ b/src/com/katapios/NumberGeneratorClass.java
@@ -0,0 +1,17 @@
+package com.katapios;
+
+public class NumberGeneratorClass {
+
+    public Integer add(Integer n){
+        return n + 10;
+    }
+
+    public Double add(Double n){
+        return n + 10.0;
+    }
+
+    public String add(String n){
+        return "String " + n;
+    }
+
+}