Added ability to swim

* Added Foot::flap() to advance the location of the penguin by 2
* Updated comment

Author: colabug

src/animals/Penguin.java

@@ -41,8 +41,15 @@ public Penguin( int age,
 
     public void waddle()
     {
-        System.out.println( "Creating a penguin" );
+        System.out.println( "Waddling" );
         leftFoot.moveForward();
         rightFoot.moveForward();
     }
+
+    public void swim()
+    {
+        System.out.println( "Swimming" );
+        rightFoot.flap();
+        leftFoot.flap();
+    }
 }

src/animals/parts/Foot.java

@@ -21,4 +21,9 @@ public void moveForward()
     {
         location++;
     }
+
+    public void flap()
+    {
+        location += 2;
+    }
 }