dev: prefer from_be_bytes to load_word

[enitrat]

from_be_bytes is a generic implementation that tries converting a collection of bytes to a type T.

Refactor the codebase to use from_be_bytes and from_be_bytes_partial instead of load_word for better maintainability.

[enitrat]

by converting each individual byte / intermediate result to felt252, we could avoid step overhead related to u256 checks. Although, it's unclear whether this should be done with STWO in mind.

[mubarak23]

I am applying to this issue via OnlyDust platform.

My background and how it can be leveraged

I am a Experience Cairo smart contract developer with experience working on projects such as Just Art Peace, Dojo, Kart, TBA, and Shinigami. Before transitioning to Cairo development, I was a backend developer specializing in Rust.

My recent work with cairo starknet

• check for coinbase maturity keep-starknet-strange/raito#128
• validate relative lock time on input of transaction keep-starknet-strange/raito#143
• lock and is_lock function of lockable component horuslabsio/TBA#45
• feat: _asReferencePubParams check horuslabsio/coloniz-core#60
• Ft nft mint quest keep-starknet-strange/art-peace#121
• feat: nullifier_registry contract functions keep-starknet-strange/zkramp#33
• Ft username store contract keep-starknet-strange/art-peace#32
• Account v3 test coverage horuslabsio/TBA#53

My recent work with rust

• https://github.com/mubarak23/axum-user-auth
• remove debug info from emitting antoyo/rustc_codegen_gcc#1
• Remove pass test antoyo/rustc_codegen_gcc#5
• feat(balance): add inbound lightning liquidity to GetBalancesResponse fedimint/fedimint#5994
• https://github.com/mubarak23/soroban-bank

How I plan on tackling this issue

I estimate this will take 16hrs to complete.

This is how I would tackle this issue:

• Refactor the codebase to use from_be_bytes and from_be_bytes_partial instead of load_word for better maintainability.

[guha-rahul]

I am applying to this issue via OnlyDust platform.

My background and how it can be leveraged

Being a cairo dev and a newcomer to the kakarot codebase , i think this will be a good issue to get familiar with the codebase.

How I plan on tackling this issue

1. Go through the entire codebase
   2.locate where from_be_bytes is located and replace that with from_be_bytes_partial along with other changes that are required!

[lordshashank]

I am applying to this issue via OnlyDust platform.

My background and how it can be leveraged

Hi, I have been contributing in odhacks for quite some time now and have expertise in rust and blockchain specs , few of them are

• Contributed to Floresta as Summer of Bitcoin 2024 fellow
• contributed to RUst lang's codegen GCC and implemented new traits and tests.
• Contributed to starknet rust devnet in odhack

How I plan on tackling this issue

I will search for possible usecases of from_be_bytes and from_be_bytes_partial in codebase and replace load_word with them for better practices and maintainability
I will ensure all the tests pass without breaking anything.

[onlydustapp]

The maintainer enitrat has assigned lordshashank to this issue via OnlyDust Platform.
Good luck!