Write BYTES to MIFARE without trancoding to ASCII-HEX

@gcjr this looks promising! Sorry... I'm not experienced as a programmer, so could you please show me how I can use the string "d73f7a79" (string-variable) as input?
I can't really figure out what the hell is going on with the following^^:

(char *)"d73f7a79"

I have to put in my (for example):

String input = "d73f7a79";

Thank you very much!