function groupByFirstLetter(words: string[]): Record<string, string[]> {
  return words.reduce((acc,cur) => {
    const firstLetter = cur.charAt(0).toLowerCase();
    if(!acc[firstLetter]) acc[firstLetter] = [cur];
    else acc[firstLetter] = [...acc[firstLetter],cur]
    return acc;
  },{})
}

// No modificar: necesario para evaluar el resultado.
export { groupByFirstLetter };