Generate a YGOPro Lua script for the following Yu-Gi-Oh card effect:
This card must attack if able. If this face-up card is targeted for an attack: Change its battle position. During your Main Phase, you can Normal Summon 1 "Karakuri" monster in addition to your Normal Summon/Set. (You can only gain this effect once per turn.)
--カラクリ小町 弐弐四
--Karakuri Komachi mdl 224 "Ninishi"
local s,id=GetID()
function s.initial_effect(c)
	--must attack
	local e1=Effect.CreateEffect(c)
	e1:SetType(EFFECT_TYPE_SINGLE)
	e1:SetCode(EFFECT_MUST_ATTACK)
	c:RegisterEffect(e1)
	--pos change
	local e2=Effect.CreateEffect(c)
	e2:SetDescription(aux.Stringid(id,0))
	e2:SetCategory(CATEGORY_POSITION)
	e2:SetType(EFFECT_TYPE_TRIGGER_F+EFFECT_TYPE_SINGLE)
	e2:SetCode(EVENT_BE_BATTLE_TARGET)
	e2:SetOperation(s.posop)
	c:RegisterEffect(e2)
	--extra summon
	local e3=Effect.CreateEffect(c)
	e3:SetDescription(aux.Stringid(id,1))
	e3:SetType(EFFECT_TYPE_FIELD)
	e3:SetRange(LOCATION_MZONE)
	e3:SetTargetRange(LOCATION_HAND|LOCATION_MZONE,0)
	e3:SetCode(EFFECT_EXTRA_SUMMON_COUNT)
	e3:SetTarget(aux.TargetBoolFunction(Card.IsSetCard,SET_KARAKURI))
	c:RegisterEffect(e3)
end
s.listed_series={SET_KARAKURI}
function s.posop(e,tp,eg,ep,ev,re,r,rp)
	local c=e:GetHandler()
	if c:IsFaceup() and c:IsRelateToEffect(e) then
		Duel.ChangePosition(c,POS_FACEUP_DEFENSE,0,POS_FACEUP_ATTACK,0)
	end
end