Create a function that takes in a sentence and returns the average length of each word in that sentence. Round your result to two decimal places.
average_word_length("A B C.") ➞ 1.00
average_word_length("What a gorgeous day.") ➞ 4.00
average_word_length("Dude, this is so awesome!") ➞ 3.80
Ignore punctuation when counting the length of a word.