创建工程不能用驼峰命名
flutter create ofFile
"ofFile" is not a valid Dart package name.
From the [Pubspec format
description](https://www.dartlang.org/tools/pub/pubspec.html):
**DO** use `lowercase_with_underscores` for package names.
Package names should be all lowercase, with underscores to separate words,
`just_like_this`. Use only basic Latin letters and Arabic digits: [a-z0-9_].
Also, make sure the name is a valid Dart identifier -- that it doesn't start
with digits and isn't a reserved word.
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