Answers of varying lengths:
sub interlace { # 52
my$x=pop;my$y=reverse+pop;$x=~s/./chop($y).$&/esg;$x
}
sub interlace { # 47
my$x=pop;@_=split//,pop;$x=~s/./shift.$&/esg;$x
}
sub interlace { # 45
($_,@_)=(pop,split//,pop);s/./shift.$&/esg;$_
}
The last two suffer a mandatory 'shift without parens' warning.
Update: here's a shorter one, without said warning.
sub interlace { # 43
$_=shift;@_=split//,pop;s/./$&.shift/esg;$_
}
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