cmd/fix: use strings.Cut
Change-Id: Ibee86b4c5dc9a18df9bdc65b0ec8339ee1cac7a9
GitHub-Last-Rev:
336580707cd58f2c17ec4c686d54982417d1a4b4
GitHub-Pull-Request: golang/go#55911
Reviewed-on: https://go-review.googlesource.com/c/go/+/435739
Reviewed-by: Ian Lance Taylor <iant@google.com>
Reviewed-by: Dmitri Shuralyov <dmitshur@google.com>
Run-TryBot: Ian Lance Taylor <iant@golang.org>
Auto-Submit: Ian Lance Taylor <iant@google.com>
TryBot-Result: Gopher Robot <gobot@golang.org>
Run-TryBot: Ian Lance Taylor <iant@google.com>