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Build an operating system with full GUI and file system support that executes in the browser. Its what I am currently working on.

Ah interesting idea!

Reminds me of this project by Fabrice Bellard: https://bellard.org/jslinux/

In 3 weeks!? If you want something tricky a compacting memory allocator in C should be doable in 3 weeks. Maybe I'm just slow! :(