tari-project / tari / 6391323881

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feat: prevent possible division by zero in difficulty calculation (#5828)

Description
---
Prevented possible division by zero panic in `fn
u256_scalar_to_difficulty(scalar: U256) -> Result<Difficulty,
DifficultyError>`

Motivation and Context
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Code should not be able to panic.

How Has This Been Tested?
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Unit test added

What process can a PR reviewer use to test or verify this change?
---
Code walkthrough

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Breaking Changes
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- [x] None
- [ ] Requires data directory on base node to be deleted
- [ ] Requires hard fork
- [ ] Other - Please specify

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