code: function _createSpotInEnteredMagicWords(spot, chars) {
    const firstChar = chars.substring(0, 1)
    const remainingChars = chars.substring(1)
    const nextSpot = (spot[firstChar] = spot[firstChar] || {})
    if (remainingChars) {
      return _createSpotInEnteredMagicWords(nextSpot, remainingChars)
    } else {
      return nextSpot
    }
  }
docs: Recursively creates a new object property if one does not exist
  for each character in the chars string.
  @param {object} spot
  @param {string} chars
  @returns {object} - the final object.
  @private