def data_paths(date, filename):
    """
    This function prepares the paths and new name of the file, 
    with the format I desire. In this case, date_filename.csv. 
    Date comes from get_strdate() function.
    """
    # Standard name of the file, the SIH always put it like this.
    path_src = filename
    # Path destination, this part also sets new name of file.
    path_destination = '/home/mmvi/mexico/petroleum'
    path_destination += f'/data/{date}_POZOSCOMPILADO.csv'
    # Returns path_src: original path of file, as it's in the same working 
    # directory it does not needs the full path.
    # Returns path_destination: Full path to data directory, where I want the
    # files to be stored. Sets the new name for move_data() function.
    return path_src, path_destination