CC furnace array

inventoryName="tile_extrautils_chestfull_name"
furnaceName="container_furnace"
sides={"north","south"}

function wrapPs(peripheralName)
    periTab={}
    sideTab={}
    if peripheralName==nil then
        print("Fehler")
    end
    local peripherals = peripheral.getNames()
    local i2 = 1
    for i =1, #peripherals do
        if peripheral.getType(peripherals[i])==peripheralName then
            periTab[i2]=peripheral.wrap(peripherals[i])
            sideTab[i2]=peripherals[i]
            i2=i2+1
        end
    end
    if periTab~={} then
        return periTab,sideTab
    else
        return nil
    end
end

chests=wrapPs(inventoryName)
furns=wrapPs(furnaceName)

function getSumOfItems()
soi=0
    for i=1, #chests do
        if chests[i]~=nil then
            if chests[i].getStackInSlot(1)~=nil then
                soi=soi+chests[i].getStackInSlot(1).qty
            end
        end
    end
return soi
end

function evenOut()
    soi=getSumOfItems()
    finished=false
    continue=true
    while continue do
    finished=true
        for i=1, #chests do
            if chests[i]~=nil then
                if chests[i].getStackInSlot(1)~=nil then
                    if chests[i].getStackInSlot(1).qty>soi/#chests then
                        soi=soi+chests[i].pushItemIntoSlot(sides[math.random(2)],1,1,1)
                        finished=false
                    end
                end
            end
        end
        if finished==true then
            continue=false
        end
    end
end