refactor 67

Author: fishercoder1534

src/main/java/com/fishercoder/solutions/_67.java

@@ -1,43 +1,33 @@
 package com.fishercoder.solutions;
 
-/**
- * 67. Add Binary
- *
- * Given two binary strings, return their sum (also a binary string).
- * For example,
- * a = "11"
- * b = "1"
- * Return "100".
- */
-
 public class _67 {
-  public static class Solution1 {
-    /**
-     * credit: https://discuss.leetcode.com/topic/13698/short-ac-solution-in-java-with-explanation
-     * 1. use StringBuilder.reverse() function! Nice!
-     * 2. if a numeric number is represented/stored in String, how to get its value: use Character.getNumericValue(s.charAt(i))
-     * 3. directly adding/subtracting chars will end up working with their ASCII numbers, e.g. chars[0] = 'a', chars[1] = 'b', then chars[0] + chars[1] will become 195.
-     */
-    public String addBinary(String a, String b) {
-      int carry = 0;
-      int i = a.length() - 1;
-      int j = b.length() - 1;
-      StringBuilder sb = new StringBuilder();
-      while (i >= 0 || j >= 0) {
-        int sum = carry;
-        if (i >= 0) {
-          sum += a.charAt(i--) - '0';
-        }
-        if (j >= 0) {
-          sum += b.charAt(j--) - '0';
+    public static class Solution1 {
+        /**
+         * credit: https://discuss.leetcode.com/topic/13698/short-ac-solution-in-java-with-explanation
+         * 1. use StringBuilder.reverse() function! Nice!
+         * 2. if a numeric number is represented/stored in String, how to get its value: use Character.getNumericValue(s.charAt(i))
+         * 3. directly adding/subtracting chars will end up working with their ASCII numbers, e.g. chars[0] = 'a', chars[1] = 'b', then chars[0] + chars[1] will become 195.
+         */
+        public String addBinary(String a, String b) {
+            int carry = 0;
+            int i = a.length() - 1;
+            int j = b.length() - 1;
+            StringBuilder sb = new StringBuilder();
+            while (i >= 0 || j >= 0) {
+                int sum = carry;
+                if (i >= 0) {
+                    sum += a.charAt(i--) - '0';
+                }
+                if (j >= 0) {
+                    sum += b.charAt(j--) - '0';
+                }
+                sb.append(sum % 2);
+                carry = sum / 2;
+            }
+            if (carry != 0) {
+                sb.append(carry);
+            }
+            return sb.reverse().toString();
         }
-        sb.append(sum % 2);
-        carry = sum / 2;
-      }
-      if (carry != 0) {
-        sb.append(carry);
-      }
-      return sb.reverse().toString();
     }
-  }
 }