function groupByFirstLetter(words: string[]): Record<string, string[]> {
  let group = {}
  words.forEach((v)=>{
    const gkey = v.charAt(0).toLowerCase()
    if(!group[gkey]) group[gkey] = []
    group[gkey].push(v)
  })
  return group;
}

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