HOW DO I CAN NAME ITEMS

[rose mist]

I'm new at modding for mc and it says this shi
"The method setCustomName(MutableText) is undefined for the type ItemStack"

private static int giveHearts(ServerPlayerEntity executor, int amount) {
UUID uuid = executor.getUuid();
int heartCount = PlayerDataManager.getPlayerHeartCount(uuid);

    if (heartCount <= amount) {
        executor.sendMessage(Text.literal("§cYeterli kalbiniz yok! En az " + (amount + 1) + " kalp olmalı."), true);
        return 0;
    }

    PlayerDataManager.setPlayerHeartCount(uuid, heartCount - amount);

    double newMaxHealth = (heartCount - amount) * 2.0;
    executor.getAttributeInstance(EntityAttributes.MAX_HEALTH).setBaseValue(newMaxHealth);
    executor.setHealth((float) Math.min(executor.getHealth(), newMaxHealth));

    for (int i = 0; i < amount; i++) {
        ItemStack heartItem = new ItemStack(Items.NETHER_STAR);
        // Use setCustomName for 1.21.10
      **  heartItem.setCustomName(Text.literal("§c❤️ Kalp"));**
        executor.getInventory().offerOrDrop(heartItem);
    }

    executor.sendMessage(Text.literal("§c❤ " + amount + " kalbinizi verdiniz! Kalan kalp sayınız: " + (heartCount - amount)), true);
    return 1;
}

i'm trying to make mod like lifestealsmp for playing with my friends i did ask to ai and it stuck.
Can someone help me

[pearl siren]

!!code

[severe yew]

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[rose mist]

?????

[runic zodiac]

custom name is controlled by a data component

[rose mist]

can u send me a example

[runic zodiac]

check how the anvil works?