fix for prd

Helius

2022-07-16 2eb36669bbb1eadba821eb1e6282501e8860e866

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

@@ -24,4 +24,6 @@
    BigInteger blockNumber();

    BigInteger totalSupply();

    String safeMintNFT(String toAddress);
}