duplicate organizeByTag function
On page 171, the test example has the organizeByTag function declared
and defined in two places. One definition should be removed.
In addition, the one defined inside the main function doesn’t take the
toDoObjects parameter.
It’s probably a better practice to define it in the main function instead
of outside of it (that way it’s ‘hidden’ from the global scope), but since
this is just a test application to set up the functionality, it doesn’t
really matter either way.
Thanks to Ken Hommel for pointing this out!
