Here is the flutter doctor result:
flutter doctor
[√] Flutter (Channel stable, 1.22.1, on Microsoft Windows [Version 10.0.18362.30], locale en-US) [√] Android t
Check your flutter PATH
which flutter
if you get /path-to-flutter-sdk/bin//flutter or similar you may have added an extra / in your $HOME/.rc_file. Remove the last '/', restart terminal and try again
/path-to-flutter-sdk/bin//flutter