refactor: push down method m2 from class A to class B

Author: rodrigo-brito

src/p8/A.java

@@ -4,8 +4,4 @@ public class A {
   public void m1() {
     System.out.println("m1");
   }
-
-  public void m2() {
-    System.out.println("m2");
-  }
 }

src/p8/B.java

@@ -1,6 +1,10 @@
 package p8;
 
 public class B extends A {
+  public void m2() {
+    System.out.println("m2");
+  }
+
   public void m3() {
     System.out.println("m3");
   }