¿Cuál es la diferencia entre RunApp () y Main () en Flutter?
main(): This function starts the program. Flutter does not allow us
to write any program without the main() function.
runApp(): Using runApp(), you are able to return the widgets
that are connected to the screen as a root of the widget tree
that will be rendered on the screen. This function is called in
the main function, which is the driver of the app.
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