test modify

reverse.go

@@ -6,5 +6,5 @@ func Reverse(s string) string {
     for i, j := 0, len(r)-1; i < len(r)/2; i, j = i+1, j-1 {
         r[i], r[j] = r[j], r[i]
     }
-    return string(r)
+    return string(r) + ".."
 }