Write a function count_message_from_domain which reads the file /cxldata/datasets/project/mbox-short.txt.
This function counts how many messages have come from each domain, stores the count in a Map, and then returns the Map. The email can be found by second word after you split every line that starts with 'From:'
If your logic is correct then your function should return below Map:
Map(umich.edu -> 7, media.berkeley.edu -> 4, caret.cam.ac.uk -> 1, uct.ac.za -> 6, iupui.edu -> 8, gmail.com -> 1)
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