Lock.sol Contract Refactor

[chauhan-varun]

Closes #67

1. Lock.sol Contract

Changes Implemented

• Modern Solidity practices
  • Introduced immutable state variables: i_unlockTime, i_owner
• Custom errors
  • Replaced require statements for improved gas efficiency
• Enhanced documentation
  • Complete NatSpec documentation for all functions
• Additional functionality
  • getBalance() function
  • getTimeRemaining() function
  • receive() function for additional deposits
• Security improvements
  • Implemented Checks-Effects-Interactions pattern
  • Better error handling
  • Safer Ether transfer using call

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2. Test File (test/Lock.ts)

Updates Made

• Added tests for new immutable variables (i_unlockTime, i_owner)
• Updated tests to use custom errors instead of require messages
• Added tests for new functions:
  • getBalance()
  • getTimeRemaining()
• Added tests for deposit functionality
• Added test for requirement that funds must be provided at deployment

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3. Ignition Module (ignition/modules/Lock.ts)

• Already compatible with the new contract interface
• No changes required

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✅ Key Improvements Made

• Gas Efficiency: Custom errors and immutable variables
• Security: Stronger access control and safer Ether transfers
• Functionality: Getter functions and deposit capabilities
• Testing: Comprehensive test coverage for all new features
• Documentation: Complete NatSpec documentation

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📊 Status

• Tests passing: 15/15
• Compilation: Successful
• Compatibility: Maintains backward compatibility with deployment infrastructure

The refactored Lock.sol contract now follows modern Solidity best practices while ensuring security, gas efficiency, and comprehensive testing.

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