Z80 Routines:Optimized:StrCopy

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StrCopy:
;Copy zero terminated string at HL to DE.
;Destroys AF, DE, HL
	xor	a		;4
$$:
	cp	(hl)		;7
	ldi			;16
	jr	nz,$b		;12
	ret			;5

Change jr to jp to save a couple clocks and add a byte.

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