build method
- @override
override
    Subclasses should override this function to actually call the appropriate
build function (e.g., StatelessWidget.build or State.build) for
their widget.
Implementation
@override
Widget build() => widget.child;Subclasses should override this function to actually call the appropriate
build function (e.g., StatelessWidget.build or State.build) for
their widget.
@override
Widget build() => widget.child;