Return variable name

def get_var_name(self, i):
        """
        Return variable name
        """
        i = c_int(i)
        name = create_string_buffer(MAXSTRLEN)
        self.library.get_var_name.argtypes = [c_int, c_char_p]
        self.library.get_var_name(i, name)
        return name.value