修改生成英文证书时姓名多替换了个字母

src/main/java/com/peanut/modules/common/service/impl/UserCertificateServiceImpl.java

@@ -358,7 +358,7 @@ public class UserCertificateServiceImpl extends ServiceImpl<UserCertificateDao,
             for (int i = 0; i < sss.length; i++) {
                 String ss = sss[i];
                 if (!"".equals(ss)){
-                    ss = ss.replace(ss.charAt(0),Character.toUpperCase(ss.charAt(0)));
+                    ss = ss.replaceFirst(".", String.valueOf(Character.toUpperCase(ss.charAt(0))));
                     if (i==0){
                         nick = ss;
                     }else {