Shared is a low-level smart pointer that provides manual reference-counted memory management for a single value. Inspired by Rc, it allows allocating, accessing and freeing memory directly using unsafe primitives. The project demonstrates key unsafe operations, including raw pointer manipulation, manual reference counting and explicit dropping of values.

Key features:

• Allocates memory on the heap manually using alloc and dealloc.
• Supports shared ownership via manual reference counting.
• Provides safe-style access through Deref and DerefMut.
• Supports any Rust type, including primitives, structs and collections.
• Ensures proper cleanup when the last reference is dropped.
• Includes tests for reading, writing, mutating, cloning and verifying memory is freed correctly.