I've added fuel cost calculation. IFS will use the price it calculates for
stick along with the cooking time needed for an item to calculate the cost for smelting that item.
For example, stick is calculated by IFS to cost 0.5$ (based on log price). Smelting 1 iron ore needs 2 sticks. This means that if iron ore costs 50$, iron ingot now costs 51$.
Feel free to join the IFS Discord server in case you have questions or want to chat:
https://discord.gg/Rtpj3PN