def clean_text(text):

    """
    This function uses the previously defined functions to take a string and
    run it through the entire data preprocessing process.
    """

    #clean, tokenize, and lemmatize a string
    tokens = preprocess(text)
    filtered_tokens = remove_stopwords(tokens)
    lemmatized_tokens = lemmatize(filtered_tokens)
    clean_text = ' '.join(lemmatized_tokens)

    return(clean_text)