rounding func

function round2(num, places)
        num = tostring(num)
        local inc = false
        local decimal = string.find(num, "%.")
        if num == nil then
          num = 1
        end
        if decimal == nil then
          decimal = 1
        end
        if num:len() - decimal <= places then return tonumber(num) end --already rounded, nothing to do.
        local digit = tonumber(num:sub(decimal + places + 1))
        num = num:sub(1, decimal + places)
        if digit <= 4 then return tonumber(num) end --no incrementation needed, return truncated number
        local newNum = ""
        for i=num:len(), 1, -1 do
                digit = tonumber(num:sub(i))
                if digit == 9 then
                        if i > 1 then
                                newNum = "0"..newNum
                        else
                                newNum = "10"..newNum
                        end
                elseif digit == nil then
                        newNum = "."..newNum
                else
                        if i > 1 then
                                newNum = num:sub(1,i-1)..(digit + 1)..newNum
                        else
                                newNum = (digit + 1)..newNum
                        end
                        return tonumber(newNum) --No more 9s found, so we are done incrementing. Copy remaining digits, then return number.
                end
        end
        return tonumber(newNum)
end