(1) Sure, Here you are.
(2) Sure, here you are.
(3) Sure. Here you are.
Which pattern is correct?
(1) is wrong. g. as a proper name.
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(1) is wrong. It is never correct to follow a comma with a capitalised word unless that word is capitalised in its own right, e.g. as a proper name.
(2) and (3) are OK. (3) feels more staccato, as you would expect.