@staticmethod
def snake2camel(letters, delimiter='_'):
    """
        Allow one or more letters convert into CamelCase. (單、複數詞組由"底線"轉"駝峰"")
        'my_model_name' -> 'MyModelName'
        :param letters: input a word. (輸入單詞)
        :param delimiter: customize a split symbol, defual='_'. (指定分隔符，預設='_')
        :return: converted string
        """
    if delimiter not in letters:
        return letters.title()
    return letters.title().replace(delimiter, '')
