def count_word(sentence):
    words = []
    word = ""

    for character in sentence:
        if character.isalnum() or character == " ":
            word += character.lower()
        else:
            if word.strip("'"):
                words.append(words.strip("'"))
            word = ""
    if word.strip("'"):
        words.append(word.strip("'"))

        result = {}

    for word in words:
        result[word] = result.get(word, 0) + 1

        return result