Create DAppContract.sol

smart-contracts/contracts/DAppContract.sol

@@ -0,0 +1,33 @@
+// SPDX-License-Identifier: MIT
+pragma solidity ^0.8.0;
+
+contract DAppContract {
+    string public name;
+    address public owner;
+    mapping(address => uint256) public balances;
+
+    event Deposit(address indexed user, uint256 amount);
+    event Withdraw(address indexed user, uint256 amount);
+
+    constructor(string memory _name) {
+        name = _name;
+        owner = msg.sender;
+    }
+
+    function deposit() external payable {
+        require(msg.value > 0, "Deposit amount must be greater than 0");
+        balances[msg.sender] += msg.value;
+        emit Deposit(msg.sender, msg.value);
+    }
+
+    function withdraw(uint256 amount) external {
+        require(balances[msg.sender] >= amount, "Insufficient balance");
+        balances[msg.sender] -= amount;
+        payable(msg.sender).transfer(amount);
+        emit Withdraw(msg.sender, amount);
+    }
+
+    function getBalance() external view returns (uint256) {
+        return balances[msg.sender];
+    }
+}