入力：

2つの文字列（注：入力の順序は重要です）。

出力：

両方の単語/文は、それらの間に空の行が1つある行から始まります。彼らは互いに横に「歩いている」。しかし、彼らは同じ位置に同じ性格を持つとき、彼らはお互いに交差し、次に互いに隣り合って歩いていく。

あなたは混乱していますか？例を挙げてみましょう：

入力： Words crossing over & Ducks
quacking:

Word  quack n 
    s      i g
Duck  cross n  over

_{Excuse the bad MS paint..}

挑戦のルール：

• We always first go back walking a straight line after we’ve
  ‘crossed over’ before we can cross over again (see test case above
  {1} – where ing is equal, but after we’ve crossed on
  i, we first have to go back walking straight (thus
  ignoring n), before we can cross again on
  g).
• The inputs can be of different length, in which case the longer
  one continues walking in a straight line (see test cases 1, 2, 4 &
  6).
• Both inputs can be the same (see test case 3).
• The inputs won’t contain any tabs nor new-lines.
• Spaces are ignored as characters that are the same (as
  an edge case), in which case the next (non-space)
  character after that – if any – is crossing over instead (see test
  cases 3, 5 & 6).
• The inputs can have no adjacent (non-space) characters on the
  same position at all, in which case both just walk in a straight
  line horizontally (see test cases 2).
• Even if the first character is equal, we always start two lines
  apart (see test cases 3 & 6).
• Trailing spaces and a single trailing new-line are
  optional.
• You can assume the inputs will only contain printable ASCII
  characters (new-lines and tabs excluded).
• The inputs are case-sensitive, so A and
  a aren’t equal, and won’t cross over (see test case
  7).
• Both the inputs lengths will always be at least 2.
• Input & output can be in any reasonable format. Can be a single
  String with new-lines; a String-array/list; printed to STDOUT; 2D
  array of characters; etc.

一般的なルール：

• This is code-golf,
  so shortest answer in bytes wins.
  Don’t let code-golf languages discourage you from posting answers
  with non-codegolfing languages. Try to come up with an as short as
  possible answer for ‘any’ programming language.
• 
  Standard rules apply for your answer, so you are allowed to use
  STDIN/STDOUT, functions/method with the proper parameters and
  return-type, full programs. Your call.
• 
  Default Loopholes are forbidden.
• If possible, please add a link with a test for your code.
• Also, please add an explanation if necessary.

テストケース：

1. 入力： "Words crossing over" & "Ducks quacking"

1. 出力：
Word  quack n 
    s      i g
Duck  cross n  over

2. 入力： "bananas" & "ananas"

2. 出力：
bananas

ananas

3. 入力： "I see my twin!" & "I see my twin!"

3. 出力：
I  e   y  w n 
  s e m  t i !
I  e   y  w n 

4. 入力： "Is the weather nice?" & "Not really, no.."

4. 出力：
Is th ally, no..
     e
Not r  weather nice?

5. 入力： "Codegolf & Programming Puzzles" & "The golfer might solve puzzles"

5. 出力：
Code o f & Programming P z l s
    g l                 u z e
The  o fer might solve p z l s

6. 入力： "Can you turn the lights off?" & "Can you try to solve this?"

6. 出力：
C n  o   urn the  ve  s off?
 a  y u t        l   t 
C n  o   ry to so igh his?

7. 入力： "one Ampere" & "two apples"

7. 出力：
one Am les
      p
two ap ere

8. 入力： "Words crossing" & "Words Quacking"

8. 出力：
W r s cross n 
 o d       i g
W r s Quack n