Minecraft CC Tree Turtle

--not my code
function split(pString, pPattern)
   local Table = {}  -- NOTE: use {n = 0} in Lua-5.0
   local fpat = "(.-)" .. pPattern
   local last_end = 1
   local s, e, cap = pString:find(fpat, 1)
   while s do
          if s ~= 1 or cap ~= "" then
         table.insert(Table,cap)
          end
          last_end = e+1
          s, e, cap = pString:find(fpat, last_end)
   end
   if last_end <= #pString then
          cap = pString:sub(last_end)
          table.insert(Table, cap)
   end
   return Table
end
--not my code
--now my code VVV

local function parseName()
    return split(os.getComputerLabel(),"_")[4]
end

local function checkForCoal()
    print("Checking for coal")
    for i=1,16 do
        local item = turtle.getItemDetail(i)
        if item and item.name == "minecraft:coal" then
            print("There's coal!")
            return i
        end
    end
    print("No Coal")
    return false
end
local function getCoal()
    while true do
        local suc = turtle.suckUp()
        if not suc then return false end
        if checkForCoal() then
            return i
        end
    end
end

local function checkForSaplings()
    print("Checking for saplings")
    for i=1,16 do
        local item = turtle.getItemDetail(i)
        if item and item.name == "minecraft:sapling" then
            print("sapling found")
            return i
        end
    end
    print("No saplings found")
    return false
end
local function getSaplings()
    while true do
        local suc = turtle.suckUp()
        if not suc then return false end
        if checkForSaplings() then
            return i
        end
    end
end

local id = parseName()
print(id)

local modem = peripheral.find("modem")
if not modem then turtle.equipRight() turtle.select(1) sleep(1) turtle.equipRight() end
modem.open(tonumber(id)+200)

while true do
    local event,side,channel,repchannel,msg,distance = os.pullEvent("modem_message")
    print(distance)
    if distance == 1 and channel == id+200 then
        --refueling
        while true do
            if turtle.getFuelLevel() < 100 then
                if not checkForCoal() then
                    if getCoal() then
                        turtle.select(i)
                        turtle.refuel(64)
                        print("Refueled")
                    else
                        print("panic no coal")
                        --panic
                        return
                    end
                else
                    turtle.select(checkForCoal())
                    turtle.refuel(64)
                end
            else
                break
            end
        end
        --putting all the items back
        for i=1,16 do
            turtle.select(i)
            if turtle.getItemCount() > 0 and turtle.getItemDetail().name ~= "minecraft:sapling" then
                turtle.dropUp()
            end
        end
        --grabbing saplings
        if not checkForSaplings() then
            getSaplings()
            local saplingnum = checkForSaplings()
            if not saplingnum then
                print("panic no saplings")
                return
                --panic
            end
            turtle.select(checkForSaplings())
        end
        turtle.select(checkForSaplings())
        --Starting on the journey
        turtle.turnRight()
        turtle.turnRight()
        for i=1,(msg*7)+3 do
            while not turtle.forward() do
                turtle.dig()
            end
        end
        turtle.turnLeft()
        turtle.forward()
        turtle.dig()
        turtle.forward()
        repeat
            turtle.digUp()
            turtle.up()
            for r=1,4 do
                turtle.dig()
                turtle.turnRight()
            end
        until not turtle.detectUp()
        turtle.turnRight()
        turtle.turnRight()
        turtle.forward()
        while true do
            turtle.digDown()
            turtle.down()
            for r=1,4 do
                turtle.dig()
                turtle.turnRight()
            end
            local suc,bl = turtle.inspectDown()
            if suc and bl.name == "minecraft:planks" then break end
        end
        turtle.turnRight()
        turtle.turnRight()
        turtle.place()
        turtle.turnRight()
        turtle.turnRight()
        turtle.forward()
        turtle.turnRight()
        for i=1,(msg*7)+3 do
            while not turtle.forward() do
                turtle.dig()
            end
        end
    end
end