Update README.md

Author: charlesgonzales

core-java/README.md

@@ -14,25 +14,20 @@
 - [Pattern Search with Grep in Java](http://www.baeldung.com/grep-in-java)
 - [URL Encoding and Decoding in Java](http://www.baeldung.com/java-url-encoding-decoding)
 - [How to Create an Executable JAR with Maven](http://www.baeldung.com/executable-jar-with-maven)
-- [How to Design a Genetic Algorithm in Java](http://www.baeldung.com/java-genetic-algorithm)
 - [Basic Introduction to JMX](http://www.baeldung.com/java-management-extensions)
-- [AWS Lambda With Java](http://www.baeldung.com/java-aws-lambda)
 - [Introduction to Nashorn](http://www.baeldung.com/java-nashorn)
 - [Java Money and the Currency API](http://www.baeldung.com/java-money-and-currency)
 - [JVM Log Forging](http://www.baeldung.com/jvm-log-forging)
 - [Guide to sun.misc.Unsafe](http://www.baeldung.com/java-unsafe)
 - [How to Perform a Simple HTTP Request in Java](http://www.baeldung.com/java-http-request)
 - [How to Add a Single Element to a Stream](http://www.baeldung.com/java-stream-append-prepend)
-- [Kotlin Java Interoperability](http://www.baeldung.com/kotlin-java-interoperability)
 - [How to Find all Getters Returning Null](http://www.baeldung.com/java-getters-returning-null)
 - [How to Get a Name of a Method Being Executed?](http://www.baeldung.com/java-name-of-executing-method)
-- [Converting a Stack Trace to a String in Java](http://www.baeldung.com/java-stacktrace-to-string)
 - [Introduction to Java Serialization](http://www.baeldung.com/java-serialization)
 - [Guide to UUID in Java](http://www.baeldung.com/java-uuid)
 - [Guide to Escaping Characters in Java RegExps](http://www.baeldung.com/java-regexp-escape-char)
 - [Difference between URL and URI](http://www.baeldung.com/java-url-vs-uri)
 - [Broadcasting and Multicasting in Java](http://www.baeldung.com/java-broadcast-multicast)
-- [Period and Duration in Java](http://www.baeldung.com/java-period-duration)
 - [OutOfMemoryError: GC Overhead Limit Exceeded](http://www.baeldung.com/java-gc-overhead-limit-exceeded)
 - [Creating a Java Compiler Plugin](http://www.baeldung.com/java-build-compiler-plugin)
 - [Quick Guide to Java Stack](http://www.baeldung.com/java-stack)
@@ -43,7 +38,7 @@
 - [A Guide to Iterator in Java](http://www.baeldung.com/java-iterator)
 - [The Trie Data Structure in Java](http://www.baeldung.com/trie-java)
 - [Introduction to Javadoc](http://www.baeldung.com/javadoc)
-- [Guide to Externalizable Interface in Java](http://www.baeldung.com/java-externalizable)
+- [Guide to the Externalizable Interface in Java](http://www.baeldung.com/java-externalizable)
 - [A Practical Guide to DecimalFormat](http://www.baeldung.com/java-decimalformat)
 - [How to Detect the OS Using Java](http://www.baeldung.com/java-detect-os)
 - [ASCII Art in Java](http://www.baeldung.com/ascii-art-in-java)