fix bugs

hutool-core/src/test/java/cn/hutool/core/util/IdcardUtilTest.java

@@ -12,6 +12,7 @@ import org.junit.Test;
  *
  */
 public class IdcardUtilTest {
+
 	private static final String ID_18 = "321083197812162119";
 	private static final String ID_15 = "150102880730303";
 
@@ -71,4 +72,10 @@ public class IdcardUtilTest {
 		Assert.assertEquals(1, gender);
 	}
 
+	@Test
+	public void isValidCard18Test(){
+		final boolean isValidCard18 = IdcardUtil.isValidCard18("3301022011022000D6");
+		Assert.assertFalse(isValidCard18);
+	}
+
 }