def to_shared_lib(name):
    """Return library name depending on platform.

    Parameters
    ----------
    name : str
        Name of library.

    Returns
    -------
    str
        Name of library with extension.

    """
    if sys.platform.startswith('linux'):
        return name + '.so'
    elif sys.platform.startswith('darwin'):
        return name + '.dylib'
    elif sys.platform.startswith('win'):
        return name + '.dll'
    else:
        sys.exit(1)