test

rednet.open("bottom")
function substringColonToSpace(inputString)
    local startPos = string.find(inputString, ":")
    if not startPos then
        return nil, "No colon found in the input string."
    end

    local endPos = string.find(inputString, " ", startPos)
    if not endPos then
        return nil, "No space found after the colon in the input string."
    end

    return string.sub(inputString, startPos + 1, endPos - 1)
end

function twoInputStrip(str)
    first, second = str:match("(%S+)%s+(%S+)")
    return first, second
end

function getAcceptedItems()
    rednet.send(0, "items please")
    id, items = rednet.receive()
    itemdb = {}
    for _, item in pairs(items) do
        temp, itemvalue = twoInputStrip(item)
        table.insert(itemdb, substringColonToSpace(item) .. " - $" .. itemvalue)
    end
    return itemdb
end

function getMonitorDirection()
    local peripherals = peripheral.getNames()
    for _, name in ipairs(peripherals) do
        if peripheral.getType(name) == "monitor" then
            return name
        end
    end
    return nil
end

function displayItems()
    direction = getMonitorDirection()
    if direction ~= nil then
        local monitor = peripheral.wrap(direction)
        monitor.clear()
        itemdb = getAcceptedItems()
        for i, item in pairs(itemdb) do
            monitor.setCursorPos(1, i)
            monitor.write(item)
        end
    end
end

displayItems()