Get the struct of the module.

def c_struct(self):
        """Get the struct of the module."""
        member = '\n'.join(self.c_member_funcs(True))
        if self.opts.windll:
            return 'struct {{\n{}{} }} {};\n'.format(
                self._c_dll_base(), member, self.name
            )
        return 'typedef\nstruct {2} {{\n{0}\n{1}}}\n{3};\n'.format(
            self._c_dll_base(), member, *self._c_struct_names()
        )