Fix format_according_to_decimals method

apps/block_scout_web/lib/block_scout_web/views/currency_helpers.ex

@@ -42,6 +42,15 @@ defmodule BlockScoutWeb.CurrencyHelpers do
 
       iex> format_according_to_decimals(205000, Decimal.new(2))
       "2,050"
+
+      iex> format_according_to_decimals(105000, Decimal.new(0))
+      "105,000"
+
+      iex> format_according_to_decimals(105000000000000000000, Decimal.new(100500))
+      "105"
+
+      iex> format_according_to_decimals(105000000000000000000, nil)
+      "105,000,000,000,000,000,000"
   """
   @spec format_according_to_decimals(non_neg_integer() | nil, nil) :: String.t()
   def format_according_to_decimals(nil, _) do
@@ -60,10 +69,14 @@ defmodule BlockScoutWeb.CurrencyHelpers do
 
   @spec format_according_to_decimals(Decimal.t(), Decimal.t()) :: String.t()
   def format_according_to_decimals(value, decimals) do
+    if Decimal.cmp(decimals, 18) == :gt do
+      format_according_to_decimals(value, Decimal.new(18))
+    else
       value
       |> divide_decimals(decimals)
       |> thousands_separator()
     end
+  end
 
   defp thousands_separator(value) do
     if Decimal.to_float(value) > 999 do