ef count_common_occurrences(word1, word2): (str, str) -> int Given two strings, word1 and word2, return how many characters in word1 are letters that also occur in word2. You can assume all characters in the given string are lowercase. Also, spaces do not count as a common character. Algorithm: - Go through each character in word1, one by one. If this character occurs in word2, then add 1 to the count. Return total count after you're done going through the characters. > count common occurrences('bob y', 'bobbette z' >>> count common occurrences('bobbette z, 'bob y') 4