Memory management - #227
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Fixes #226
Description
It turns out that even if Rust forgets a raw pointer, it cannot be safely freed once C takes ownership. This PR adds a couple of cleanup functions that correctly dispose of structs with raw pointers when coupling to C to prevent memory leaking.
Tests
cargo test passes and RustBCA.c was used with valgrind to show that this fixes the leak. See the linked issue above.