RosettaCodeData/Task/Longest-string-challenge/Mathematica/longest-string-challenge.math

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FixedPoint[
StringReplace[#,
x : "\n" | StartOfString ~~ a : Except["\n"] ... ~~ "\n" ~~
b : Except["\n"] ... ~~ y : "\n" | EndOfString :>
x <> Switch[((#1 + #2) + Abs[#1 - #2])/2 &[StringLength@a,
StringLength@b], Except[StringLength@a], b,
Except[StringLength@b], a, _, a <> "\n" <> b] <> y] &, "a
bb
ccc
ddd
ee
f
ggg"]