Write a function called emailToNetID.
It should take a String containing an @illinois.edu email like [email protected] and return the NetID,
which in this case would be "hello", as a String.
You can assume that the passed String will contain a single @ character.
And you should require that the passed String ends with @illinois.edu.
You will want to explore the various String methods to help you with this task, particularly split.
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