fix some problem

Helius

2022-06-06 3ae668287cf4d592e95c9783a404dff881b433d9

 src/main/java/cc/mrbird/febs/dapp/chain/ContractChainService.java

@@ -20,4 +20,6 @@
    int allowanceCnt(String address);

    int decimals();

    BigInteger blockNumber();
}