Build the estimator method or function.

        Returns
        -------
        :return : string
            The built method as string.

def create_method(self):
        """
        Build the estimator method or function.

        Returns
        -------
        :return : string
            The built method as string.
        """
        n_indents = 0 if self.target_language in ['c', 'go'] else 1
        method_type = 'separated.{}.method'.format(self.prefix)
        method_temp = self.temp(method_type, n_indents=n_indents,
                                skipping=True)
        return method_temp.format(**self.__dict__)