Bug report in Substrate Arkworks Examples

[achimcc]

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Description of bug

The https://github.com/achimcc/substrate-arkworks-examples don't build properly. They seem not to compile to no_std. I have some intution that this could be problematic, because a wasmtime runtime has a limited execution stack size and ECC arithmetics involve deep nested recursive loops.

Steps to reproduce

Try to build and run https://github.com/achimcc/substrate-arkworks-examples with last up to date Substrate version.