code: public static String encode(byte[] in) {
          if (in == null) {
              return null;
          }
          return encode(in, 0, in.length);
      }
docs: Encodes the given bytes into a base-32 string.
  
  @param in
  the bytes to encode.
  
  @return The base-32 string, or null if {@code in} is null.