const MAX_SIZE = 5

let a = [5, 4, 3, 2, 1],
  b = [],
  c = [];

let abc = {
  a,
  b,
  c
}

function repeat_str(s, n) {
  return Array(n).fill(s).join('')
}

function hnt(keys, n) {
  let key0 = keys[0],
    key1 = keys[1],
    key2 = keys[2];

  if (n === 1) {
    let tip = `from ${key0} to ${key2}`
    let k = abc[key0].pop()
    abc[key2].push(k)
    console.log(`${tip} moving ${k}`)

    console.log(`after moving: a:[${abc.a}] b:[${abc.b}] c:[${abc.c}]`)
  } else {
    console.log(repeat_str('|', MAX_SIZE - n) + repeat_str('-', 20))

    let move1 = `${keys[0]}${keys[2]}${keys[1]}`;
    console.log(`hnt(${move1},${n-1})`)
    hnt(move1, n - 1)

    let move2 = `${keys[0]}${keys[1]}${keys[2]}`;
    console.log(`hnt(${move2},1)`)
    hnt(move2, 1)

    let move3 = `${keys[1]}${keys[0]}${keys[2]}`;
    console.log(`hnt(${move3},${n-1})`)
    hnt(move3, n - 1)

    console.log(repeat_str('|', MAX_SIZE - n) + repeat_str('-', 20))
  }
}

hnt("abc", 5)