code: function generateRandomString(length) {
  	let s = "";
  	let i = length;
  	while (length-- > 0) {
  		let c = Math.floor(Math.random() * (MAX_HEX_SYMBOL - MIN_HEX_SYMBOL + 1)) + MIN_HEX_SYMBOL;
  		c = c.toString(16).toLowerCase();
  		s += c;
  	}
  	return s;
  }
docs: Generates string, each symbol of that is either number or A..F
  
  @param {number} length - length of string to be generated
  @return {string} Random string of the required length