Update external.html

external.html

@@ -12,6 +12,11 @@ <h3 id="baeldung"><i class="fa fa-at" aria-hidden="true"></i>  <a href="https://
     <ul>
       <!-- <li><a href="">XXX</a></li> -->
 
+      <li><a href="https://www.baeldung.com/scala/string-operation-delete-substring">Removing a Substring From a String in Scala</a></li>
+      <li><a href="https://www.baeldung.com/scala/round-number-to-multiple-of-ten">Round a Number to the Nearest or Next Multiple of 10 in Scala</a></li>
+      <li><a href="https://www.baeldung.com/scala/number-formats">Different Ways to Format Numbers in Scala</a></li>
+      <li><a href="https://www.baeldung.com/scala/list-compute-mean-value">Calculate the Average of a List in Scala</a></li>
+      <li><a href="https://www.baeldung.com/scala/string-character-check-alphanumeric">Check if a Character Is Alpha Numeric in Scala</a></li>
       <li><a href="https://www.baeldung.com/scala/octal-decimal-number-conversion">Convert Integers Between Octal and Decimal Representations in Scala</a></li>
       <li><a href="https://www.baeldung.com/scala/string-repeat-character">Repeat a Character Multiple Times in Scala</a></li>
       <li><a href="https://www.baeldung.com/scala/list-check-equality-all-items">Check if All Elements in a List Are Equal in Scala</a></li>