Describes the cause and action for error messages.
Error Message(English):
is not finding duplicates
How to Remove Duplicates from Array Without Using Java Collection ...
https://javarevisited.blogspot.com/2014/01/how-to-remove-duplicates-from-array-java-without-collecti・・・
OCVTS Computer Science 2017 Lab
http://www.ocvts.org/classroomconnect/classrooms/mclarke1/2017-2018/lab.htm