addTokenToOwnerEnumeration
addTokenToOwner is a common internal helper in NFT and token-management smart contracts used to register ownership of a token for a specific address. It is typically invoked during minting or when ownership is assigned from a non-zero source, and it is not part of the public external API.
In a typical implementation, the function updates the contract’s internal data structures to reflect new ownership.
Because addTokenToOwner is usually marked internal, it is intended to be called only by other contract code,
Security and correctness considerations include enforcing proper access control so that only authorized parts of the