Create PI-Wallet.sol

blockchain_integration/pi_network/contracts/PI-bank/contracts/PI-Wallet.sol

@@ -0,0 +1,37 @@
+pragma solidity ^0.8.0;
+
+import "https://github.com/OpenZeppelin/openzeppelin-solidity/contracts/access/Ownable.sol";
+import "https://github.com/OpenZeppelin/openzeppelin-solidity/contracts/math/SafeMath.sol";
+
+contract PIWallet {
+    using SafeMath for uint256;
+
+    address public owner;
+    mapping (address => uint256) public balances;
+
+    event Deposit(address indexed user, uint256 amount);
+    event Withdrawal(address indexed user, uint256 amount);
+
+    constructor() public {
+        owner = msg.sender;
+    }
+
+    function deposit() public payable {
+        balances[msg.sender] = balances[msg.sender].add(msg.value);
+        emit Deposit(msg.sender, msg.value);
+    }
+
+    function withdraw(uint256 _amount) public {
+        require(_amount <= balances[msg.sender], "Insufficient balance");
+        msg.sender.transfer(_amount);
+        balances[msg.sender] = balances[msg.sender].sub(_amount);
+        emit Withdrawal(msg.sender, _amount);
+    }
+
+    function transfer(address _to, uint256 _amount) public {
+        require(_amount <= balances[msg.sender], "Insufficient balance");
+        balances[msg.sender] = balances[msg.sender].sub(_amount);
+        balances[_to] = balances[_to].add(_amount);
+        emit Transfer(msg.sender, _to, _amount);
+    }
+}