💼 EthWallet

📝 Overview

EthWallet is a smart contract that allows users to deposit, withdraw, and transfer ETH between accounts while charging a 1% transaction fee. It also demonstrates how to connect two smart contracts by delegating fee calculation to an external contract.

✨ Features

• 🔹 Deposit & Withdraw ETH: Users can securely deposit and withdraw their ETH.
• 🔹 Transfer with Fee: ETH transfers between users are charged a 1% fee.
• 🔹 Connected Smart Contracts: Fee calculation is delegated to an external contract (CalculateFees).
• 🔹 Fee Management: The contract owner can withdraw accumulated transaction fees.
• 🔹 Access Control: Only the owner can check other users' balances or withdraw fees.

🛠 Technical Details

• Solidity Version: ^0.8.24
• External Contract: CalculateFees for fee calculation.
• Key Functions:
  • deposit(): Deposits ETH into the contract.
  • withdraw(uint256 amount): Withdraws ETH up to the user's balance.
  • transfer(uint256 amount, address to): Transfers ETH with a 1% fee.
  • getYourBalance(): Returns the caller's balance.
  • getAnyBalance(address wallet): Allows the owner to check any balance.
  • withdrawFees(): Allows the owner to withdraw collected fees.

🚀 Deploying the Smart Contract

1. Open Remix IDE.
2. Create two Solidity files: EthWallet.sol and CalculateFees.sol.
3. Compile both contracts using Solidity 0.8.24.
4. Deploy CalculateFees first and copy its address.
5. Deploy EthWallet, passing the CalculateFees contract address to its constructor.

✅ Interacting & Testing

✔️ Deposit ETH

1. Call deposit() and send ETH.
2. Check the contract balance to verify the deposit.

✔️ Transfer ETH with Fee

1. Call transfer(amount, to).
2. Ensure 1% fee is deducted.
3. Verify balances of sender and receiver.

✔️ Withdraw ETH

1. Call withdraw(amount).
2. Ensure the requested amount is transferred back.

✔️ Check Balances

1. Call getYourBalance() to check your balance.
2. The owner can call getAnyBalance(wallet) to check another address.

✔️ Withdraw Fees (Owner Only)

1. Call withdrawFees().
2. Ensure the owner receives the collected fees.

📜 License

This project is licensed under LGPL-3.0-only.