docs: public static String unescapeString(String escapedString) {
          StringBuilder sb = new StringBuilder();
          for (int i = 1; i < escapedString.length() - 1; ++i) {
              char c = escapedString.charAt(i);
              if (c == '\\') {
                  ++i;
                  sb.append(unescapeChar(escapedString.charAt(i)));
              } else {
                  sb.append(c);
              }
          }
          return sb.toString();
      }