feat: update structure

cs2030s/labs/Lab4/Immutator.java

@@ -0,0 +1,12 @@
+/**
+ * The Immutator interface that can transform
+ * to type T2, an object of type T1.
+ * Contains a single abstract method invoke.
+ * CS2030S Lab 4
+ * AY22/23 Semester 1
+ * @author Yadunand Prem (10B)
+ */
+
+interface Immutator<R, P> {
+  public R invoke(P param);
+}