def read_txt_file(txt_file):
    """Read in a text file into a list of strings.

    :type txt_file: str
    :param txt_file: Filepath to the text file.
    :rtype: list
    :return: A list of strings, the lines in the text file.

    """

    with open(txt_file,"r") as f:
        strings = f.read().splitlines()
    return strings