Thanks for the review and the comment. I feel the same, but there seems no way to avoid it. My task request on improving the codes was rejected by utopian and nobody could lend a hand:

https://steemit.com/utopian-io/@dapeng/task-request-improvement-in-the-steemg-code-struction-to-avoid-copying-over-similar-code

Thus I have to let it go.