Finish the document

src/main/java/com/cleverthis/interview/Solution.java

@@ -1,12 +1,11 @@
 package com.cleverthis.interview;
 
 import com.cleverthis.interview.padlock.PadlockImpl;
-import sun.reflect.generics.reflectiveObjects.NotImplementedException;
 
 /**
  * This is a placeholder class showing a simple boilerplate.
  * This class is not required, so you can replace with your own architecture.
- * */
+ */
 public class Solution {
     public void solve(PadlockImpl padlock) {
         throw new RuntimeException("TODO");