Update README.md

core-java/README.md

@@ -22,7 +22,6 @@
 - [Difference between URL and URI](http://www.baeldung.com/java-url-vs-uri)
 - [Creating a Java Compiler Plugin](http://www.baeldung.com/java-build-compiler-plugin)
 - [Quick Guide to Java Stack](http://www.baeldung.com/java-stack)
-- [Guide to java.util.Formatter](http://www.baeldung.com/java-string-formatter)
 - [Compiling Java *.class Files with javac](http://www.baeldung.com/javac)
 - [Introduction to Javadoc](http://www.baeldung.com/javadoc)
 - [Guide to the Externalizable Interface in Java](http://www.baeldung.com/java-externalizable)
@@ -40,13 +39,7 @@
 - [Common Java Exceptions](http://www.baeldung.com/java-common-exceptions)
 - [Throw Exception in Optional in Java 8](https://www.baeldung.com/java-optional-throw-exception)
 - [Merging java.util.Properties Objects](https://www.baeldung.com/java-merging-properties)
-- [Add a Character to a String at a Given Position](https://www.baeldung.com/java-add-character-to-string)
-- [Calculating the nth Root in Java](https://www.baeldung.com/java-nth-root)
-- [Convert Double to String, Removing Decimal Places](https://www.baeldung.com/java-double-to-string)
-- [ZoneOffset in Java](https://www.baeldung.com/java-zone-offset)
 - [Merging java.util.Properties Objects](https://www.baeldung.com/java-merging-properties)
-- [A Guide to SimpleDateFormat](https://www.baeldung.com/java-simple-date-format)
-- [Changing the Order in a Sum Operation Can Produce Different Results?](https://www.baeldung.com/java-floating-point-sum-order)
 - [Java – Try with Resources](https://www.baeldung.com/java-try-with-resources)
 - [Abstract Classes in Java](https://www.baeldung.com/java-abstract-class)
 - [Guide to Character Encoding](https://www.baeldung.com/java-char-encoding)