def remove_prepended_comment(orig_df):
    """
    remove the '#' prepend to the first column name
    Note: if there is no comment, this won't do anything (idempotency).
    """
    input_df = orig_df.copy()
    first_col = input_df.columns[0]
    return input_df.rename(columns={first_col: first_col.replace('#', "")})