Remove a :class:`.Command` or subclasses from the internal list
        of commands.

        This could also be used as a way to remove aliases.

        Parameters
        -----------
        name: :class:`str`
            The name of the command to remove.

        Returns
        --------
        :class:`.Command` or subclass
            The command that was removed. If the name is not valid then
            `None` is returned instead.

def remove_command(self, name):
        """Remove a :class:`.Command` or subclasses from the internal list
        of commands.

        This could also be used as a way to remove aliases.

        Parameters
        -----------
        name: :class:`str`
            The name of the command to remove.

        Returns
        --------
        :class:`.Command` or subclass
            The command that was removed. If the name is not valid then
            `None` is returned instead.
        """
        command = self.all_commands.pop(name, None)

        # does not exist
        if command is None:
            return None

        if name in command.aliases:
            # we're removing an alias so we don't want to remove the rest
            return command

        # we're not removing the alias so let's delete the rest of them.
        for alias in command.aliases:
            self.all_commands.pop(alias, None)
        return command