anchor.diff:                      //You can get the data with dart:io or http and check it here
                       return null;
                     }
  -                  return "Faulty URL!";
  +                  return 'Faulty URL!';
                   }
                   return null;
                 },
  
positive.code:                               "${provider.displayName == null ? "" : "Name: ${provider.displayName}\n"}"),
                          ),
                        ),
                        onDismissed: (action) =>
                            widget.user.unlink(provider.providerId),
                      ),
                  ],
                ),
              Visibility(
                visible: widget.user != null,
                child: Container(
                  margin: EdgeInsets.only(top: 8.0),
                  alignment: Alignment.center,
                  child: Row(
                    mainAxisAlignment: MainAxisAlignment.spaceEvenly,
  
negative.code:   Widget build(BuildContext context) {
      return Card(
        child: Padding(
          padding: const EdgeInsets.all(16),
          child: Column(
            crossAxisAlignment: CrossAxisAlignment.start,
            children: [
              Container(
                padding: const EdgeInsets.only(bottom: 8),
                alignment: Alignment.center,
                child: const Text(
                  'User info',
                  style: TextStyle(fontWeight: FontWeight.bold),
                ),
              ),
              if (widget.user != null)
                if (widget.user.photoURL != null)
                  Container(
                    alignment: Alignment.center,
                    margin: const EdgeInsets.only(bottom: 8),
                    child: Image.network(widget.user.photoURL),
                  )
                else
                  Align(
                    child: Container(
                      padding: const EdgeInsets.all(8),
                      margin: const EdgeInsets.only(bottom: 8),
                      color: Colors.black,
                      child: const Text(
                        'No image',
                        textAlign: TextAlign.center,
                      ),
                    ),
                  ),
              Text(widget.user == null
  