def add_prefix_to_str(item: str, prefix: str, divider: str = '') -> str:
    """Adds 'prefix' to 'item' with 'divider' in between.
    
    Args:
        item (str): item to be modified.
        prefix (str): prefix to be added to 'item'.
        divider (str): str to add between 'item' and 'prefix'. Defaults to '',
            which means no divider will be added.

    Returns:
        str: modified str.

    """
    return divider.join([prefix, item])