import re


def clean_text(text):
    """
    Removes apostrophes, non-alphabet letters, newlines and sets
    everything to lowercase

    Parameters
    ----------
    text (string):
        Input text string

    Returns
    -------
    text (string):
        Cleaned text string
    """

    # Remove apostrophes
    text = re.sub("\'", "", text)
    # Leave only alphabet letters
    text = re.sub("[^a-zA-Z]"," ", text)
    # Remove new-lines
    text = re.sub("\\n", "", text)
    # Convert to lower-case
    text = text.lower()
    return text