Generate a YGOPro Lua script for the following Yu-Gi-Oh card effect:
Cards on the field cannot be returned to the Deck.
--G・B・ハンター
--G.B. Hunter
local s,id=GetID()
function s.initial_effect(c)
	--
	local e1=Effect.CreateEffect(c)
	e1:SetType(EFFECT_TYPE_FIELD)
	e1:SetCode(EFFECT_CANNOT_TO_DECK)
	e1:SetProperty(EFFECT_FLAG_IGNORE_IMMUNE+EFFECT_FLAG_SET_AVAILABLE)
	e1:SetRange(LOCATION_MZONE)
	e1:SetTargetRange(LOCATION_ONFIELD,LOCATION_ONFIELD)
	c:RegisterEffect(e1)
	local e2=e1:Clone()
	e2:SetCode(EFFECT_CANNOT_TO_HAND)
	e2:SetTarget(s.etarget)
	c:RegisterEffect(e2)
end
function s.etarget(e,c)
	return c:GetOriginalType()&TYPE_EXTRA~=0
end