The very first iteration will always be skipped because iEven == firstEvent because you starting loop at arr.begin()

ThIs Is A TeSt is the expected output for one of the tests. If we are not counting spaces, "TeSt" should be "tEsT". This is for the python tests by the way. Or if we are counting spaces, it should be "ThIs iS A TeSt". I'm still not really sure if we should be counting spaces or not.