go - How to parse long hexadecimal string into uint

Question

I'm pulling in data that is in long hexadecimal string form which I need to convert into decimal notation, truncate 18 decimal places, and then serve up in JSON.

For example I may have the hex string:

"0x00000000000000000000000000000000000000000000d3c21bcecceda1000000"

At first I was attempting to use ParseUint(), however since the highest it supports is int64, my number ends up being way too big.

This example after conversion and truncation results in 10^6. However there are instances where this number can be up to 10^12 (meaning pre truncation 10^30!).

What is the best strategy to attack this?

Answer 1

Waitting for answers