SBP: Improve cleanliness & readability

[NachoPal]

We recommend you to run

cargo +nightly fmt --all -- --check

[swowk]

CC @ytqaljn

[ytqaljn]

Thank you for your advice. After I ran this command, the inspection results suggested that I replace the use of tab with four spaces. Proposals like this fill my console. I'm hesitating whether to make such changes to the whole code. Maybe there's a convenient way

[ytqaljn]

I have used cargo FMT for formatting.(#61)

[heyworld88]

@NachoPal Thank you for your all suggestion. our developer has made adjustments. You can now check to see if satisfy your requirement. please leave comments free if you have a question.