Generate a YGOPro Lua script for the following Yu-Gi-Oh card effect:
When this card battles a Fusion Monster, the ATK of the Fusion Monster becomes 0 during the Damage Step only.
--フュージョニストキラー
--Fusion Devourer
local s,id=GetID()
function s.initial_effect(c)
	local e1=Effect.CreateEffect(c)
	e1:SetType(EFFECT_TYPE_FIELD)
	e1:SetRange(LOCATION_MZONE)
	e1:SetTargetRange(0,LOCATION_MZONE)
	e1:SetCode(EFFECT_SET_ATTACK_FINAL)
	e1:SetCondition(s.condtion)
	e1:SetTarget(s.target)
	e1:SetValue(0)
	c:RegisterEffect(e1)
end
function s.condtion(e)
	local ph=Duel.GetCurrentPhase()
	return (ph==PHASE_DAMAGE or ph==PHASE_DAMAGE_CAL) and Duel.GetAttackTarget()~=nil
		and (Duel.GetAttacker()==e:GetHandler() or Duel.GetAttackTarget()==e:GetHandler())
end
function s.target(e,c)
	return c==e:GetHandler():GetBattleTarget() and c:IsType(TYPE_FUSION)
end