Staking Contract Security Review

Review the security of this staking contract:

```
${{CONTRACT_CODE}}
```

Staking Mechanism: ${{STAKING_MECHANISM}}
Reward Token: ${{REWARD_TOKEN}}

Security review:
1. Staking mechanism analysis
2. Reward calculation vulnerabilities:
   - Rounding errors
   - Reward inflation attacks
   - Distribution timing exploits
3. Lock period security
4. Early withdrawal penalties
5. Compound staking risks
6. Multi-token reward handling
7. Emergency withdrawal functions
8. Admin privileges review
9. Integration vulnerabilities
10. Recommended improvements

Include edge case scenarios and test recommendations.