edit 504

Author: fishercoder1534

README.md

@@ -67,7 +67,7 @@ Your ideas/fixes/algorithms are more than welcome!
 |507|[Perfect Number](https://leetcode.com/problems/perfect-number/)|[Solution](../master/src/main/java/com/stevesun/solutions/PerfectNumber.java) | O(sqrt(n)) |O(1) | Easy| Math
 |506|[Relative Ranks](https://leetcode.com/problems/relative-ranks/)|[Solution](../master/src/main/java/com/stevesun/solutions/RelativeRanks.java) | O(nlogn) |O(n) | Easy|
 |505|[The Maze II](https://leetcode.com/problems/the-maze-ii/)|[Solution](../master/src/main/java/com/stevesun/solutions/TheMazeII.java) | O(m*n) |O(m*n) | Medium| BFS
-|504|[Base 7](https://leetcode.com/problems/base-7/)|[Solution](../master/src/main/java/com/stevesun/solutions/Base7.java) | O(1) |O(1) | Easy| 
+|504|[Base 7](https://leetcode.com/problems/base-7/)|[Solution](../master/src/main/java/com/stevesun/solutions/_504.java) | O(1) |O(1) | Easy| 
 |503|[Next Greater Element II](https://leetcode.com/problems/next-greater-element-ii/)|[Solution](../master/src/main/java/com/stevesun/solutions/NextGreaterElementII.java) | O(n) |O(n) | Medium| Stack
 |501|[Find Mode in Binary Tree](https://leetcode.com/problems/find-mode-in-binary-tree/)|[Solution](../master/src/main/java/com/stevesun/solutions/FindModeinBinaryTree.java) | O(n) |O(k) | Easy| Binary Tree
 |500|[Keyboard Row](https://leetcode.com/problems/keyboard-row/)|[Solution](../master/src/main/java/com/stevesun/solutions/KeyboardRow.java) | O(n) |O(1) | Easy|

src/main/java/com/stevesun/solutions/Base7.java renamed to src/main/java/com/stevesun/solutions/_504.java

@@ -12,7 +12,7 @@
 
  Note: The input will be in range of [-1e7, 1e7].
  */
-public class Base7 {
+public class _504 {
 
     public String convertToBase7(int num) {
         return String.valueOf(Integer.toString(num, 7));

src/test/java/com/stevesun/Base7Test.java renamed to src/test/java/com/stevesun/_504Test.java

@@ -1,6 +1,6 @@
 package com.stevesun;
 
-import com.stevesun.solutions.Base7;
+import com.stevesun.solutions._504;
 import org.junit.Before;
 import org.junit.BeforeClass;
 import org.junit.Test;
@@ -10,15 +10,15 @@
 /**
  * Created by stevesun on 1/15/17.
  */
-public class Base7Test {
-    private static Base7 test;
+public class _504Test {
+    private static _504 test;
     private static String expected;
     private static String actual;
     private static int num;
 
     @BeforeClass
     public static void setup(){
-        test = new Base7();
+        test = new _504();
     }
 
     @Before