Caffè corretto, an Italian beverage, consists of a shot of espresso with a small amount of liquor, usually grappa, and sometimes sambuca or brandy. It is also known (outside Italy) as an "espresso corretto".
Most Italian bartenders prepare a caffè corretto simply adding a few drops of the desired liquor into an espresso shot; however in some cases the liquor is served in a shot alongside the coffee allowing the customer to pour the quantity they desire. A few bartenders also let their regular customers make their drink themselves providing the espresso shot and the bottle of liquor.
The Italian word corretto reminds the (supposed) soundness of my code
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