code: public static <T> Stream<T> intersperse(final Stream<T> stream, final T value) {
          return stream.flatMap(t -> Stream.of(value, t))
                       .skip(1);
      }
docs: Returns a stream with a given value interspersed between any two values
  of this stream.
  
  <pre>
  {@code
  assertThat(Arrays.asList(1, 0, 2, 0, 3, 0, 4),
  equalTo( Streams.intersperse(Stream.of(1, 2, 3, 4),0));
  }
  </pre>