/**
 * Adds "\s* betweek each character of the string
 * Used to generate regexp with matches with or without spaces
 *
 * @example
 * // returns "h\s*e\s*l\s*l\s*o"
 * addSpaces("hello");
 * @returns {String} Returns the string processed.
 */
function addSpaces (word) {
  return [...word].map((e, i) => i < word.length - 1 ? [e, '\\s*'] : [e]).reduce((a, b) => a.concat(b)).join('')
}