Write a function wordcount() that takes the name of a text file as input and prints the number of occurrences of every word in the file. you function should be case-insensitive so 'hello' and 'hello' are treated as the same word. you should ignore words of length 2 or less. also, be sure to remove punctuation and digits.
> > > wordcount('frankenstein. txt')
artifice 1
resting 2
compact 1
service 3