in tool/extract.dart [105:117]
String _createDirAndFileName(File sourceFile, int count) {
final String filename = p.basename(sourceFile.path);
final String dartFileName = p.join(
generatedExampleDirPath,
sourceFile.parent.path,
'${filename.replaceAll('-', '_').replaceAll('.', '_')}_$count.dart',
);
Directory(p.join(
generatedExampleDirPath,
sourceFile.parent.path,
)).createSync(recursive: true);
return dartFileName;
}