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How Asar Find the freespace?

When you patch an asar patch, you don't need to locate freespace.

That means it detect empty freespace automatically.

And my question is..

If I patch an asar patch twice, is my ROM using up twice more freespaces than once?
since asar detects empty freespace.

Receiving?
As long as the patch is coded/converted properly, then no extra freespace will be used as far as I know. If Asar displays something about freespace leaks, though, then it will use up twice the freespace.

...but, all the patches here are made properly.
That's what the "autoclean" command deals with. If you have that in your patches, no unnecessary space will be eaten.

If you don't, no worries; Asar will warn you about that.