update 05 solution

Author: Kyle Liu

lcof/of004/README.md

@@ -1,19 +1,17 @@
 package Solution
 
 func replaceSpace(s string) string {
-	result := make([]rune, len(s)*3)
+	ans := make([]rune, len(s)*3)
 
 	i := 0
 	for _, v := range s {
 		if v != ' ' {
-			result[i] = v
+			ans[i] = v
 			i++
 		} else {
-			result[i] = '%'
-			result[i+1] = '2'
-			result[i+2] = '0'
+			ans[i], ans[i+1], ans[i+2] = '%', '2', '0'
 			i += 3
 		}
 	}
-	return string(result)[:i]
+	return string(ans)[:i]
 }