rename

Author: fishercoder1534

README.md

@@ -164,7 +164,7 @@ Your ideas/fixes/algorithms are more than welcome!
 |454|[4Sum II](https://leetcode.com/problems/4sum-ii/)|[Solution](../master/src/main/java/com/fishercoder/solutions/_454.java) | O(n) |O(n) | Medium| HashMap
 |453|[Minimum Moves to Equal Array Elements](https://leetcode.com/problems/minimum-moves-to-equal-array-elements/)|[Solution](../master/src/main/java/com/fishercoder/solutions/MinimumMovestoEqualArrayElements.java)| O(n)|O(1) | Easy|
 |452|[Minimum Number of Arrows to Burst Balloons](https://leetcode.com/problems/minimum-number-of-arrows-to-burst-balloons/)|[Solution](../master/src/main/java/com/fishercoder/solutions/_452.java) | O(nlogn) |O(1) | Medium| Array, Greedy
-|451|[Sort Characters By Frequency](https://leetcode.com/problems/sort-characters-by-frequency/)|[Solution](../master/src/main/java/com/fishercoder/solutions/SortCharactersByFrequency.java) | O(nlogn) |O(n) | Medium| HashMap
+|451|[Sort Characters By Frequency](https://leetcode.com/problems/sort-characters-by-frequency/)|[Solution](../master/src/main/java/com/fishercoder/solutions/_451.java) | O(nlogn) |O(n) | Medium| HashMap
 |450|[Delete Node in a BST](https://leetcode.com/problems/delete-node-in-a-bst/)|[Solution](../master/src/main/java/com/fishercoder/solutions/_450.java)| O(?)|O(?) | Medium| Tree, Recursion
 |449|[Serialize and Deserialize BST](https://leetcode.com/problems/serialize-and-deserialize-bst/)|[Solution](../master/src/main/java/com/fishercoder/solutions/SerializeandDeserializeBST.java)| O(n)|O(h) | Medium| BFS
 |448|[Find All Numbers Disappeared in an Array](https://leetcode.com/problems/find-all-numbers-disappeared-in-an-array/)|[Solution](../master/src/main/java/com/fishercoder/solutions/_448.java)| O(n)|O(1) | Easy| Array, HashMap

src/main/java/com/fishercoder/solutions/SortCharactersByFrequency.java renamed to src/main/java/com/fishercoder/solutions/_451.java

@@ -42,7 +42,7 @@
  Note that 'A' and 'a' are treated as two different characters.
 
  */
-public class SortCharactersByFrequency {
+public class _451 {
 
     public String frequencySort(String s) {
         Map<Character, Integer> map = new HashMap();

src/test/java/com/fishercoder/SortCharactersByFrequencyTest.java renamed to src/test/java/com/fishercoder/_451Test.java

@@ -1,6 +1,6 @@
 package com.fishercoder;
 
-import com.fishercoder.solutions.SortCharactersByFrequency;
+import com.fishercoder.solutions._451;
 import org.junit.Before;
 import org.junit.BeforeClass;
 import org.junit.Test;
@@ -10,15 +10,15 @@
 /**
  * Created by fishercoder on 1/15/17.
  */
-public class SortCharactersByFrequencyTest {
-    private static SortCharactersByFrequency test;
+public class _451Test {
+    private static _451 test;
     private static String expected;
     private static String actual;
     private static String input;
 
     @BeforeClass
     public static void setup(){
-        test = new SortCharactersByFrequency();
+        test = new _451();
     }
 
     @Before