Create a loooong teeeext generator that takes in a string and an integer n, and multiplies the vowels in the string by n.

longText.js

const longText = (str, num) => {
  if (typeof str !== 'string') return 'Input must be a valid string'
  let newStr = ''
  const vowels = ['a', 'e', 'i', 'o', 'u']
  for (let char of str) {
    if (vowels.includes(char)) {
      newStr += char.repeat(num)
    } else {
      newStr += char
    }
  }
  return newStr
}

// $longText('hello world', 3) --> heeellooo wooorld