modifyContentsFile function
Create the Contents.json file
Implementation
Future<void> modifyContentsFile(
String newIconName,
String? darkIconName,
String? tintedIconName,
) async {
final String newContentsFilename =
iosAssetFolder + newIconName + '.appiconset/Contents.json';
final contentsJsonFile = await File(newContentsFilename).create(recursive: true);
final String contentsFileContent =
generateContentsFileAsString(newIconName, darkIconName, tintedIconName);
await contentsJsonFile.writeAsString(contentsFileContent);
}