Takes two topmost items and concatenates them, pushes the result to the top of the stack

Input stack: a b

Output stack: ab

PumpkinDB> "Hello, " "world!" CONCAT
"Hello, world!"


Allocates for a result of concatenation

EmptyStack error if there are less than two items on the stack


concat : "Hello, " "world!" CONCAT "Hello, world!" EQUAL?.
concat_requires_two_items_0 : [CONCAT] TRY UNWRAP 0x04 EQUAL?.
concat_requires_two_items_1 : [1 CONCAT] TRY UNWRAP 0x04 EQUAL?.

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