About the problem I'm having when trying to convert a FormattedCharSequence to a String.

I override the drawInBatch method in my custom font renderer, and then I use the following code to return the font instance.

    @Override
    public void initializeClient(Consumer<IClientItemExtensions> consumer) {
        consumer.accept(new IClientItemExtensions() {
            @Override
            public @NotNull Font getFont(ItemStack stack, FontContext context) {
                return SuperFont.INSTANCE;
            }
        });
    }

My code is as follows.
 

public class SuperFont extends Font {
    private float tick = 0.0f;

    public SuperFont(Function<ResourceLocation, FontSet> p_243253_, boolean p_243245_) {
        super(p_243253_, p_243245_);
        MinecraftForge.EVENT_BUS.register(this);
    }

    @SubscribeEvent
    public void tick(TickEvent.ClientTickEvent evt) {
        if (evt.phase == TickEvent.Phase.START) {
            this.tick += 1.0f;
            if (this.tick >= 720.0f) {
                this.tick = 0.0f;
            }
        }
    }
      
    @Override
    public int drawInBatch(@NotNull FormattedCharSequence formattedCharSequence, float x, float y, int color, boolean boolean1, @NotNull 	   Matrix4f matrix4f, @NotNull MultiBufferSource multiBufferSource, boolean boolean2, int int1, int int2) {
        float the_step = 0.0f;
        String text = formattedCharSequence.toString();
        text = text.replaceAll("§[0-9a-fA-Fklmnor]", "");
        char[] array_char = text.toCharArray();
        for (char c : array_char) {
            String s = String.valueOf(c);
            int tc = Color.HSBtoRGB(this.nextColorHue(the_step) / 100.0f, 0.8f, 0.8f);
            super.drawInBatch(s, x, y, tc, boolean1, matrix4f, multiBufferSource, boolean2, int1, int2);
            x += (float) this.width(String.valueOf(c));
            the_step += 1.0f;
        }
        return (int)x;
    }
      
    public float nextColorHue(float the_step) {
        float tick = (this.tick + the_step) % 720.0f;
        if (tick >= 360.0f) {
            return 720.0f - tick;
        }
        return tick;
    }
      
    public static final SuperFont INSTANCE = new SuperFont(Minecraft.getInstance().fontManager.createFont().fonts, true);
}

I also used Access Transformer.
 

public-f net.minecraft.client.Minecraft f_91045_ # fontManager

But I get it in the game.

https://upload.cc/i1/2023/07/02/LDePEB.png
I checked many posts and questions, as well as official documentation, but I couldn't find a class or method that can convert types.