I would like to know if somebody knows a algorithm that does the following.
convert a string with hex-chars into a string with decim-chars by using low-level commands.
given: hex_string="0462E62fcf"

"0462E62fcf"->1659252687
I want this number into a string.
You can't use variables that have a value greater than 65536.
this means you can't use mod().