Using sub-commands in slash commands

This is how to use Subcommands within your Slash Commands for your bots.

To make a subcomamnd within your command use this

#include <dpp/dpp.h>
#include <dpp/fmt/format.h>
#include <iostream>
 
int main() {
 
    /* Setup the bot */
    dpp::cluster bot("token");
    
    /* Executes on ready. */
    bot.on_ready([&bot](const dpp::ready_t & event) {
    // Define a slash command.
    dpp::slashcommand image;
        image.set_name("image");
        image.set_description("Send a specific image.");
        image.add_option(
            // Create a subcommand type option.
            dpp::command_option(dpp::co_sub_command, "dog", "Send a picture of a dog.").
                add_option(dpp::command_option(dpp::co_user, "user", "User to make a dog off.", false))
            );
        image.add_option(
            // Create another subcommand type option.
            dpp::command_option(dpp::co_sub_command, "cat", "Send a picture of a cat.").
                add_option(dpp::command_option(dpp::co_user, "user", "User to make a cat off.", false))
            );
    // Create command with a callback.
    bot.global_command_create(image, [ & ]( const dpp::confirmation_callback_t &callback ) {
                        if(callback.is_error()) {
                            std::cout << callback.http_info.body <<  "\n" ;
                        }
        });
    });
 
    /* Use the on_interaction_create event to look for commands */
    bot.on_interaction_create([&bot](const dpp::interaction_create_t & event) {
            if (event.command.type == dpp::it_application_command) {
                dpp::command_interaction cmd_data = std::get<dpp::command_interaction>(event.command.data);
 
                /* Check if the command is the image command. */
                if(cmd_data.name == "image") {
                    /* Check if the subcommand is "dog" */
                    if(cmd_data.options[0].name == "dog") { 
                        /* Checks if the subcommand has any options. */
                        if(cmd_data.options[0].options.size() > 0) {
                            /* Get the user option as a snowflake. */
                            dpp::snowflake user = std::get<dpp::snowflake>(cmd_data.options[0].options[0].value);
                            event.reply(dpp::ir_channel_message_with_source, fmt::format("<@{}> has now been turned into a dog.", user)); 
                        } else {
                        /* Reply if there were no options.. */
                        event.reply(dpp::ir_channel_message_with_source, "<A picture of a dog.>");
                        }
                    }
                    /* Check if the subcommand is "cat" */
                    if(cmd_data.options[0].name == "cat") {
                        /* Checks if the subcommand has any options. */
                        if(cmd_data.options[0].options.size() > 0) {
                            /* Get the user option as a snowflake. */
                            dpp::snowflake user = std::get<dpp::snowflake>(cmd_data.options[0].options[0].value);
                            event.reply(dpp::ir_channel_message_with_source, fmt::format("<@{}> has now been turned into a cat.", user));
                        } else {
                        /* Reply if there were no options.. */
                        event.reply(dpp::ir_channel_message_with_source, "<A picture of a cat.>");
                        }
                    }
                }
            }
    });
 
    bot.start(false);
    return 0;
}