Function contract::mint::get_new_token_id

fn get_new_token_id(
    tokenid_by_hash_uref: URef, 
    metadata_hash: String, 
    tokens_cnt_uref: URef
) -> u64

Gets a new token_id from the contract state and returns is as a u64

It will get tokenid_by_hash_uref, metadata_hash, tokens_cnt_uref, and firstly look into the tokenid_by_hash_uref dict, if it could find the metadatahash in it, it would return the token_id of that nft Otherwise, it would get the tokens_cnt, and use tokens_cnt+1 as new token_id , and returns it. Also modifies the tokens_cnt to tokens_cnt+1