Generate the specific filename.

        Parameters
        ----------
        :param class_name : str
            The used class name.

        :param language : {'c', 'go', 'java', 'js', 'php', 'ruby'}
            The target programming language.

        Returns
        -------
            filename : str
            The generated filename.

def _get_filename(class_name, language):
        """
        Generate the specific filename.

        Parameters
        ----------
        :param class_name : str
            The used class name.

        :param language : {'c', 'go', 'java', 'js', 'php', 'ruby'}
            The target programming language.

        Returns
        -------
            filename : str
            The generated filename.
        """
        name = str(class_name).strip()
        lang = str(language)

        # Name:
        if language in ['java', 'php']:
            name = "".join([name[0].upper() + name[1:]])

        # Suffix:
        suffix = {
            'c': 'c', 'java': 'java', 'js': 'js',
            'go': 'go', 'php': 'php', 'ruby': 'rb'
        }
        suffix = suffix.get(lang, lang)

        # Filename:
        return '{}.{}'.format(name, suffix)