unfollow method
Implementation
Future<bool> unfollow(String? atsign) async {
atsign = formatAtSign(atsign);
var atKey = this._formKey(isFollowing: true);
var atMetadata = atKey.metadata;
var result = await _modifyKey(atsign, this.following, atKey);
if (result) {
atKey..sharedWith = atsign;
atMetadata?..isPublic = false;
atKey..metadata = atMetadata;
await _sdkService.notify(
atKey, atsign!, OperationEnum.delete, _onNotifyDone, _onNotifyError);
await _sdkService.sync();
}
return result;
}