Hey guys, does anyone know how to add "breeding nft" for smart contract and dapp? I am interested in erc721 and erc20. If anyone knows where I can read this or look it up, I would appreciate it)!
THX!

More precisely, I can't figure out how to write a constructor that can use existing tokens.
Example: I have 2 tokens, if I add them to breeding, I get another more unique one, and the past 2 are burned.

I'm not asking to write me a code, I'm asking where to look to learn it.

Thank you!!!