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Write a function that takes
an array of characters and reverses the
letters in place.
Why an array of
characters instead of a string?
The goal of this
question is to practice manipulating arrays
in place. Since Swift strings support
unicode, a single character in a string might
be multiple bytes. There's
no way to get
the ith character in a
To sidestep this complexity, we'll work with
arrays of characters instead, which let us
quickly access characters at any offset.
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