Write a function called word_count. word_count takes as #input a string called my_string, and returns as output the #number of words in the string. For the purposes of this #problem, you can assume that every space indicates a new #word; so, the number of words should be one more than the #number of spaces. You may also assume that any strings are #not empty, so there should always be at least one word if #my_string is a string. #