Check if memory leak exist

I'm worryed about if there could kinds of memory leak exist where I use several hacks in unsafe code block.
I can not find any signs of memory leaks in example code and harness test codes until now, but it cannot prove there could be any kind of memory leaks.

Start by reviewing the unsafe code in the binding and running the existing example and harness test code; the issue names no files or failing case. Done means a reproducible leak is isolated and covered, or the reviewed paths and test results document why no leak was found.

Written by the indexing model from the issue text.