macro_rules! hand { ( $( $x:literal ),* ) => { ... }; }
Make const array of Card objects from string literals. For example, hand!("Ac", "2d", "3h") is equivalent to [ACE_OF_CLUBS, DEUCE_OF_DIAMONDS, TREY_OF_HEARTS].
hand!("Ac", "2d", "3h")
[ACE_OF_CLUBS, DEUCE_OF_DIAMONDS, TREY_OF_HEARTS]