submission

DeadmansSwitch.sol

@@ -4,21 +4,34 @@ pragma solidity ^0.8.0;
 contract DeadmansSwitch {
     // TODO: Declare state variables
     // Hint: You'll need variables for the owner, beneficiary, and last check-in block
+    address owner;
+    address beneficiary;
+    uint last_block;
 
     // TODO: Implement constructor
-    constructor(address _beneficiary) {
+    constructor(address _beneficiary) payable {
         // Hint: Initialize state variables
+        require(_beneficiary != address(0), "Beneficiary cannot be the zero address");
+        owner = msg.sender;
+        beneficiary = _beneficiary;
+        last_block = block.number;
     }
 
     // TODO: Implement still_alive function
     function still_alive() public {
         // Hint: Update the last check-in block
+        require(msg.sender == owner, "Only the owner can call this function");
+        last_block = getCurrentBlock();
     }
 
     // TODO: Implement release funds function
     function releaseFunds() public {
         // Hint: Check if 10 blocks have passed since last check-in
         // If so, transfer the contract balance to the beneficiary
+        require(getCurrentBlock() > getLastCheckInBlock() + 10, "Owner is still alive!");
+        require(address(this).balance > 0, "No funds to release");
+
+        payable(beneficiary).transfer(address(this).balance);
     }
 
     // TODO: Implement receive function to allow the contract to receive Ether
@@ -27,6 +40,7 @@ contract DeadmansSwitch {
     // Helper function for testing (optional)
     function getLastCheckInBlock() public view returns (uint256) {
         // TODO: Return the last check-in block
+        return last_block;
     }
 
     // Helper function for testing (optional)