function uniqueWords(text: string): string[] {
  if (text == "") return []
  const arr = text.toLowerCase().split(" ")
  const resp = []
  arr.forEach((word) => {
    const count = arr.filter(x => x == word)
    if (count.length == 1) {
      resp.push(...count)
    }
  })
  return resp;
}

// Do not modify: needed to evaluate the result.
export { uniqueWords };