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function reverse_in_place(a[0 .. (n - 1)])

function reverse_in_place(a[0 .. n])
    for i from 0 to floor( ((n + 1) / 2) - 1 )
        tmp  := a[i]
        a[i] := a[n - i]
        a[n - i] := tmp

use strict;
use warnings;
...

    return join('', @array);
}