function caesarCipher(text: string, shift: number): string {
  const abc = 'abcdefghijklmnopqrstuvwxyz';
  const mayusAbc = abc.toUpperCase();
  let resp = ''
  text.split('').forEach(char => {
    if (abc.includes(char) || mayusAbc.includes(char)) {
      const isUpper = /[A-Z]/.test(char)
      if (isUpper) {
        const index = mayusAbc.indexOf(char)
        const newIndex = index + shift
        if (newIndex > abc.length - 1) {
          resp += mayusAbc[newIndex - abc.length]
        } else {
          resp += mayusAbc[newIndex]
        }
      } else {
        const index = abc.indexOf(char)
        const newIndex = index + shift
        if (newIndex > abc.length - 1) {
          resp += abc[newIndex - abc.length]
        } else {
          resp += abc[newIndex]
        }

      }
    } else {
      resp += char
    }
  })
  return resp;
}

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