Merge pull request #15 from certikfoundation/minibank.sol

minibank.sol

@@ -0,0 +1,53 @@
+pragma solidity ^0.5.12;
+
+contract MiniBank {
+
+    // the contract owner
+    address public owner;
+    // the bank accounts mapper
+    mapping (address => uint) private accounts;
+    // event for deposit log
+    event LogDeposit(address indexed accountAddress, uint amount);
+    // event for withdraw log
+    event LogWithdraw(address indexed withdrawAddress, uint amount);
+
+    constructor()  public {
+        // 1. set the owner to your current account 
+        // add the code here
+    }
+
+    /// Deposit amount into MiniBank
+    /// @return User balance after the deposit is made
+    function deposit() public payable returns (uint) {
+
+        require((accounts[msg.sender] + msg.value) >= accounts[msg.sender]);
+
+        // 2. add msg.value to the user account
+        // add the code here
+
+
+        emit LogDeposit(msg.sender, msg.value); 
+        return accounts[msg.sender];
+    }
+
+    /// Withdraw amount from MiniBank
+    /// @param withdrawAmount amount for withdrawing
+    /// @return The ramaining balance 
+    function withdraw(uint withdrawAmount) public returns (uint) {
+        require(withdrawAmount <= accounts[msg.sender]);
+        // 3. decrease user balance
+        // add the code here
+
+        msg.sender.transfer(withdrawAmount);
+
+        // 4. emit LogWithdraw event
+        // add the code here
+
+        return accounts[msg.sender];
+    }
+
+    /// @return The user balance
+     function balance() view public returns (uint) {
+        return accounts[msg.sender];
+    }
+}