fixed

src/main/java/cn/cslg/pas/service/common/PatentStarApiService.java

@@ -939,10 +939,10 @@ public class PatentStarApiService {
     public String formatCnNumber(String str) {
         StringBuilder builder = new StringBuilder();
         builder.append(str, 0, 2);
-        String sub = str.substring(2, 3);
-        if (sub.equals("9")) {
+        int num = Integer.parseInt(str.substring(2, 3));
+        if (num > 6) {
             builder.append("19");
-        } else if (sub.equals("0")) {
+        } else {
             builder.append("20");
         }
         builder.append(str, 2, 5);