refactor 287

Author: fishercoder1534

src/main/java/com/fishercoder/solutions/_287.java

@@ -37,7 +37,7 @@ public int findDuplicate(int[] nums) {
                 if (slow == fast) {
                     break;
                 }
-            }
+            }w
 
             while (true) {
                 slow = nums[slow];