charactersInRange0

function charactersInRange0(ch1, ch2) {
  'use strict'

  let n1 = ch1.charCodeAt(0)
  let n2 = ch2.charCodeAt(0)

  //min и max
  const swap = (a, b) => {
    if (a > b) {
      let c = b
      b = a
      a = c
    }
    return [a, b]
  }

  [n1, n2] = swap(n1, n2)

  let output = ''
  for (let i = n1 + 1; i < n2; i++)
    output += String.fromCharCode(i) + ' '

  console.log(output)
}