Clippy has advice.
https://cdn.masto.host/mastodongamedevplace/media_attachments/files/112/205/715/991/946/561/original/3737ae2e2e98e1ea.png
CLIPPY: Use of `format!` to build up a string from an iterator.
ME: You do what now?
CLIPPY: For further information visit https://rust-lang.github.io/rust-clippy/master/index.html#format_collect
ME: Oooh! I didn't know you could accept the accumulator as mutable. Thanks, Clippy!
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