File: url-decode

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S9 LIB  (url-decode string)  ==>  string

Decode an URL-encoded string. In an URL-encoded string, each subsequence
of the form %NN represents a character with the ASCII code NN, where NN
is a two-digit hexa-decimal number. URL-DECODE creates a fresh string
where each %NN sequence has been replaced by the corresponding character.
When STRING contains invalid %NN sequences, URL-DECODE returns #F.

(url-decode "%46%4F%4FBAR")  ==>  "FOOBAR"