>>>
final _appUrl = Platform.isIOS
    ? 'https://itunes.apple.com/us/app/google-adwords/id1037457231'
    : 'https://play.google.com/store/apps/details?id=com.google.android.apps.'
    'adwords';
<<<
final _appUrl = Platform.isIOS
    ? 'https://itunes.apple.com/us/app/google-adwords/id1037457231'
    : 'https://play.google.com/store/apps/details?id=com.google.android.apps.'
        'adwords';