3 of 3 added 60 characters in body

Jelly,  15  14 bytes

Ḳ⁾""j$€⁹¦K¥ⱮJ$

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How?

Ḳ⁾""j$€⁹¦K¥ⱮJ$ - Link: list of characters, S
Ḳ              - split (S) at spaces -> A
             $ - last two links as a monad:
           Ɱ   -   map...
            J  -   ...across: range of length -> I = [1,2,...len(A)]
          ¥    -   ...doing: last two links as a dyad: i.e. f(A, i) for i in I
      € ¦      -     sparse application...
       ⁹       -     ...to indices: chain's right argument, i
     $         -     ...action: last two links as a monad:
 ⁾""           -       literal list of characters = ['"', '"']
    j          -       join (with A[i]) -> (e.g. with ['i','s']) ['"','i','s','"']
         K     -     join with spaces