A better version of my Muti TPS system

Message = "heck,notheck,isheck,isalsoheck,andheck"
tab = {}
a = 1
lastnumber = nil

Message = Message..",''"

for i=1,string.len(Message) do
    if string.sub(Message,i,i) == "," and lastnumber == nil then
        table.insert(tab,a)
        table.insert(tab,string.sub(Message,1,i-1))
        lastnumber = i
        a=a+1
    elseif string.sub(Message,i,i) == "," and lastnumber ~= nil then
        table.insert(tab,a)
        table.insert(tab,string.sub(Message,lastnumber+1,i-1))
        lastnumber = i
        a=a+1
    end
end


value = #tab

for i=2,value,2 do
    print("num: "..tab[i-1].."\nPlayer: "..tab[i].."\n\n")
end