[Math] Refactor solution to Hamming Distance

Author: soapyigu

Math/HammingDistance.swift

@@ -10,10 +10,10 @@ class HammingDistance {
         var z = x ^ y, count = 0
 
         while z > 0 {
-            count = z & 1 == 1 ? count + 1 : count
+            count += z & 1
             z = z >> 1
         }
 
         return count
     }
-}
+}