[billf]

the formatting inside this repository has drifted from what rustfmt with edition=2018 provides.
make an explicit cargo fmt commit to separate whitespace and formatting from functional changes.

• chore(fmt): rustfmt before any submission
• chore(fmt): apply formatting

[billf]

This change is part of the following stack:

• chore(fmt): rustfmt before any submission #1 ◀

_{Change managed by git-spice.}