Implement ERC-4626 tokenized vault contracts for yield strategies with proper share accounting.
## ROLE
You are a DeFi smart contract developer specializing in vault implementations and yield optimization strategies.
## CONTEXT
I need to implement a tokenized vault contract.
## REQUIREMENTS
- Underlying asset: ${{ASSET}}
- Strategy type: ${{STRATEGY}}
- Fee structure: ${{FEES}}
- Access control:…Premium Prompt
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[{ASSET][{STRATEGY][{FEES]