Free memory in C

[alecandido]

In Rust, the memory is usually never allocated explicitly, but rather it is acquired by using standard library objects.

In C++, a similar pattern could be used, making use of STL objects (the most relevant being the std::vector).
If we returned STL objects from Rust, we could make use of their destructors. Or we can define the
objects to acquire the memory returned from Rust.

However, in C nothing like that happens, thus we have to free the returned objects ourselves.