fix oracle utxo to only mint 1

validators/oracle_nft.ak

@@ -2,23 +2,21 @@ use aiken/collection/list
 use aiken_virtual_dex/types.{MintPolarity, RBurn, RMint}
 use cardano/assets.{PolicyId}
 use cardano/transaction.{Input, OutputReference, Transaction}
-use vodka_mints.{check_policy_only_burn}
+use vodka_mints.{check_policy_only_burn, only_minted_token}
 
 validator oracle_nft(utxo_ref: OutputReference) {
   mint(redeemer: MintPolarity, policy_id: PolicyId, tx: Transaction) {
     when redeemer is {
       RMint -> {
-        let Transaction { inputs, .. } = tx
+        let Transaction { inputs, mint, .. } = tx
         let hash_equal =
           fn(input: Input) {
             let hash = input.output_reference
             utxo_ref == hash
           }
-        let target_input_exist = list.find(inputs, hash_equal)
-        when target_input_exist is {
-          Some(_) -> True
-          None -> False
-        }
+        let target_input_exist = list.any(inputs, hash_equal)
+        let check_only_minted_token = only_minted_token(mint, policy_id, #"", 1)
+        target_input_exist && check_only_minted_token
       }
       RBurn -> check_policy_only_burn(tx.mint, policy_id)
     }