export default function transformBrands(inputData) {
  const groups = {};

  // 遍历输入数据，按首字母分组
  inputData.forEach(brand => {
    const letter = brand.bfirstletter;
    if (!groups[letter]) {
      groups[letter] = [];
    }
    groups[letter].push({ name: brand.name,id:brand.id });
  });

  // 将分组转换为数组并按字母排序
  return Object.keys(groups)
    .sort()
    .map(letter => ({
      letter,
      cars: groups[letter]
    }));
}