[1.15]How to create a structure by commands in the game？

How to create a structure by commands in the game？

I did like this.

public class summonCommand implements Command<CommandSource> {
    public static structureCommand instance = new structureCommand();

    @Override
    public int run(CommandContext<CommandSource> context) throws CommandSyntaxException {
        StringTextComponent stc = new StringTextComponent("");
        context.getSource().sendFeedback(stc, false);
        return 0;
    }
}

What shoud I do next...