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edited Oct 3, 2022 at 23:06

Factor, 31³¹ 28 bytes

[ 33 interleaved "[I !%s${}!"printf ]I]]

33 interleaved Insert an exclamation point between each character.
33 interleaved Insert an exclamation point between each character of the input.
!%s!"printf Insert an exclamation point at the beginning and end and print it.
[I !${}!I] Interpolate the above string into the ${}, adding exclamation points to the beginning and end, and print.

[ 33 interleaved "!%s!"printf ]

33 interleaved Insert an exclamation point between each character.
!%s!"printf Insert an exclamation point at the beginning and end and print it.

[ 33 interleaved [I !${}!I]]

33 interleaved Insert an exclamation point between each character of the input.
[I !${}!I] Interpolate the above string into the ${}, adding exclamation points to the beginning and end, and print.

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created Oct 3, 2022 at 22:50

[ 33 interleaved "!%s!"printf ]

33 interleaved Insert an exclamation point between each character.
!%s!"printf Insert an exclamation point at the beginning and end and print it.