Пустые string после присваивания значения в инициализаторе

#pragma once
 
#include <string>
 
#include "JSON/json.h"
 
class Action {
public:
    std::string type{};
 
    virtual Json::Value toJson() = 0;
};
 
class TextAction : public Action{
private:
    std::string getPayload() {
        std::string res;
        res += "{\"command\":\"";
        res += command.c_str();
        res += "\"}";
        return res;
    }
public:
    std::string command{};
    std::string label{};
 
    TextAction(std::string label, std::string command) {
        type = "text";
        this->label = label;
        this->command = command;
    }
 
    Json::Value toJson() {
        Json::Value value;
        value["type"] = type;
        value["label"] = label;
        value["payload"] = getPayload();
        return value;
    }
 
};
 
class Button {
public:
    Action *action;
    std::string color{};
 
    Button(std::string color, Action* action) {
        this->color = color.c_str();
        this->action = action;
    }
 
    Json::Value toJson() {
        Json::Value value;
        value["color"] = color;
        value["action"] = action->toJson();
        return value;
    }
};
 
class Keyboard {
private:
    Json::Value getButtons() {
        Json::Value value;
        for (int i = 0; i < buttons.size(); i++)
            value[i] = buttons[i]->toJson();
        return value;
    }
 
public:
    bool oneTime;
    std::vector<Button*> buttons;
    bool inlineButtons;
 
    Keyboard(std::vector<Button*> buttons, bool oneTime, bool inlineButtons) {
        this->oneTime = oneTime;
        this->inlineButtons = inlineButtons;
        this->buttons = buttons;
    }
 
    std::string buildKeyboard() {
        Json::Value value;
        if (inlineButtons)
            value["inline"] = inlineButtons;
        else value["one_time"] = oneTime;
        value["buttons"] = getButtons();
        std::string res{};
        std::stringstream stream{};
        stream << value;
        stream >> res;
        return res;
    }
 
};

Keyboard keyboard{
    {
        &Button{"primary", &TextAction{"test", "test 1"}},
        &Button{"secondary", &TextAction{"test", "test 2"}},
        &Button{"negative", &TextAction{"test", "test 3"}},
        &Button{"positive", &TextAction{"test", "test 4"}}
    },
    false, true 
};