Oh I found out I was trying to concat a char with a string; however, there is still issues with this challenge even when you put the unicode into a string. Running my code on coderpad or repl works just fine.

Anyone else having issues with the pound sign in Java. Keep getting "error: unmappable character for encoding ASCII".

Error: Command failed: javac -verbose -cp /home/codewarrior -d /home/codewarrior -sourcepath /home/codewarrior -cp /usr/local/groovy/lib/junit-4.12.jar:/usr/local/groovy/lib/hamcrest-core-1.3.jar /home/codewarrior/Kata.java /home/codewarrior/BonusTimeTest.java ./frameworks/java/CwRunListener.java
[parsing started RegularFileObject[/home/codewarrior/Kata.java]]
[parsing completed 28ms]
/home/codewarrior/BonusTimeTest.java:10: error: unmappable character for encoding ASCII
assertEquals((wellConfigured?"??":"\u00A3")+"100000",Kata.bonusTime(10000, true));
^
/home/codewarrior/BonusTimeTest.java:10: error: unmappable character for encoding ASCII
assertEquals((wellConfigured?"??":"\u00A3")+"100000",Kata.bonusTime(10000, true));

...