code: public static <T1, T2> FluentFunctions.FluentBiFunction<T1, T2, Tuple2<T1, T2>> expression(final BiConsumer<? super T1, ? super T2> action) {
          return FluentFunctions.of((t1, t2) -> {
              action.accept(t1, t2);
              return Tuple.tuple(t1, t2);
          });
      }
docs: Convert a BiConsumer into a FluentBiFunction that returns it's input in a Tuple
  <pre>
  {@code
  public void withTwo(Integer a,Integer b){
  System.out.println(a+b);
  }
  FluentFunctions.expression(this::withTwo)
  .applyHKT(1,2)
  
  returns Tuple2[1,2]
  
  }
  </pre>
  @param action BiConsumer
  @return FluentBiFunction