function uniqueWords(text: string): string[] {

  if (text.trim().length <= 0) return []
  
  const textToArr = text.toLowerCase().split(" ")
  const uniqueWords = []

  textToArr.forEach(value => {
    if (textToArr.indexOf(value) !== textToArr.lastIndexOf(value)) return

    uniqueWords.push(value)
  })

  return uniqueWords
}

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