Как убрать нуль после точки?

function round(num, n) -- Функция округляет до указанного количества знаков
   local n = (n or 0)
   return tonumber(string.format("%."..n.."f", num))
end

local defparams = { ['scale'] = 6, ['step'] = 0.000001 }
local strm = '-'
local stre = ''
local strf =
{
   [0] = '%s%u',
   [1] = '%s%u.%01u',
   [2] = '%s%u.%02u',
   [3] = '%s%u.%03u',
   [4] = '%s%u.%04u',
   [5] = '%s%u.%05u',
   [6] = '%s%u.%06u',
   [7] = '%s%u.%07u',
   [8] = '%s%u.%08u',
   [9] = '%s%u.%09u'
}
local pwr10 =
{
   [0] = 1,
   [1] = 10,
   [2] = 100,
   [3] = 1000,
   [4] = 10000,
   [5] = 100000,
   [6] = 1000000,
   [7] = 10000000,
   [8] = 100000000,
   [9] = 1000000000,
}
local seccache = {}

local function SecCacheMiss(classcode, seccode)
   local t = getSecurityInfo(classcode, seccode)
   if not t or not t.scale then
      return defparams
   end
   local tsec = seccache[seccode]
   if not tsec then
      tsec = {}
      seccache[seccode] = tsec
   end
   local tcls = tsec[classcode]
   if not tcls then
      tcls = { ['scale'] = t.scale, ['step'] = t.min_price_step }
      tsec[classcode] = tcls
   end
   return tcls
end

local function GetSecParams(classcode, seccode)
   local tsec = seccache[seccode]
   if not tsec then
      return SecCacheMiss(classcode, seccode)
   end
   local tcls = tsec[classcode]
   if not tcls then
      return SecCacheMiss(classcode, seccode)
   end
   return tcls
end

function FormatPrice(classcode, seccode, price)
   if nil == price then price = 0 end
   local prefix
   if price < 0 then
      prefix = strm
      price = math.abs(price)
   else
      prefix = stre
   end
   local sp = GetSecParams(classcode, seccode)
   local iprice, fprice = math.modf(math.floor(price / sp.step + 0.5) * sp.step)
   return string.format(strf[sp.scale], prefix, iprice, math.floor(fprice * pwr10[sp.scale] + 0.5))
end

function FormatPriceFlushCache()
   seccache = {}
end

require('FormatPrice')

string_price = FormatPrice(class_code, sec_code, price)

FormatPriceFlushCache()