def __create_send_data(username, icon_emoji, message):
    """Create sending data

    Arguments:
        username {string} -- Slack display user name
        icon_emoji {string} -- Slack display emoji-icon (e.g. :hogehoge:)
        message {string} -- Message contents

    Returns:
        [dict] -- Sending data for JSON payload
    """
    msg = {}
    if username:
        msg['username'] = username
    if icon_emoji:
        msg['icon_emoji'] = icon_emoji
    if message:
        msg['text'] = message
    return msg