import discord

async def execute(bot, params, message):
    categories = params.get('categories', [])
    if not categories:
        # Fallback for single category
        categories = [params]
    guild = message.guild
    renamed_count = 0
    for category_params in categories:
        category_name = category_params.get('category_name')
        new_name = category_params.get('new_name')
        category = discord.utils.find(lambda cat: cat.name.casefold() == category_name.casefold(), guild.categories)
        if not category:
            await message.channel.send(f"Catégorie '{category_name}' introuvable.")
            continue
        try:
            await category.edit(name=new_name)
            renamed_count += 1
        except discord.Forbidden:
            await message.channel.send(f"Je n'ai pas les permissions pour renommer la catégorie '{category_name}'.")
    if renamed_count > 0:
        await message.channel.send(f"{renamed_count} catégorie(s) renommée(s).")