feat: update structure

cs2030s/labs/Lab4/Actionable.java

@@ -0,0 +1,13 @@
+/**
+ * The Actionable interface that can
+ * act when given an action.
+ * Contains a single abstract method act.
+ * CS2030S Lab 4
+ * AY22/23 Semester 1
+ * @author Yadunand Prem (10B)
+ */
+
+// act consumes the T and passes it to action, thus super
+interface Actionable<T> {
+  public void act(Action<? super T> action);
+}