Multiple fnc1 in ean128 support

[avazbabayev]

First, Thank you for this great library.

I edited your code and add fnc1 to show multiple piece of data in one barcode. But before the special character (fnc1) when the numbers are even it works. When the number is odd, it shows (24) instead of 8. (Ascii code) . Can you please help me to solve this issue