Merge branch 'otc' of http://120.27.238.55:7000/r/exchange into otc

xiaoyong931011

2021-05-26 a0da4723b75c2bb13d2b4bef8fed196c678ddcde

 src/main/java/com/xcong/excoin/utils/CoinTypeConvert.java

@@ -47,4 +47,12 @@
                return null;
        }
    }

    public static String convertContractTypeToCoin(String symbol) {
        if (symbol.indexOf("/") > 0) {
            return symbol.substring(0, symbol.indexOf("/"));
        } else {
            return null;
        }
    }
}