def clean_top(df_top):
    """
    Removes empty data at top of file

    :param df_top:
    :return:
    """
    for i in range(len(df_top)):
        for j in range(4):
            if isinstance(df_top.iloc[i, j], str) and '\r\n' in df_top.iloc[
                i, j]:
                df_top.iloc[i, j] = df_top.iloc[i, j].replace('\r\n', '')
