cargo fmt code

[BTCLTC]

substrate lesson1, I need send a pull request. I also only fmt the master branch code.

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[cecton]

Duplicated with #5456

We don't use rustfmt in Substrate.

Here you can find our style guide.

[jayzhan211]

What is the reason that Substrate don't use rustfmt?

[cecton]

Some people don't like the styling of rustfmt

[Demi-Marie]

I wonder if rustfmt is configurable enough to match our style guide.

[cecton]

It might very well be now. It's been a long time. There is an issue about exactly that somewhere actually.

[jayzhan211]

It might very well be now. It's been a long time. There is an issue about exactly that somewhere actually.

I hope we can reconsider using rustfmt. 👍

[cecton]

Found it: #286

[kianenigma]

also #2156