code: function pushInUnicode(cat, elt) {
    if (!unicode.hasOwnProperty(cat)) {
      unicode[cat] = {
        unicode: [],
        ranges: []
      };
    }
  
    if (Array.isArray(elt)) {
      unicode[cat].ranges.push(elt);
    } else {
      unicode[cat].unicode.push(elt);
    }
  }
docs: Function that pushes in an object an attribute to store the characters