diff --git a/smart contract b/smart contract
new file mode 100644
index 00000000000..9dc5603aa8e
--- /dev/null
+++ b/smart contract	
@@ -0,0 +1,36 @@
+// SPDX-License-Identifier: MIT
+
+pragma solidity 0.8.17;
+
+contract ControlStructures {
+    error AfterHours(uint256 time);
+    error AtLunch();
+
+    function fizzBuzz(uint256 _number) public pure returns (string memory response) {
+        if (_number % 3 == 0 && _number % 5 == 0) {
+            return "FizzBuzz";
+        } else if (_number % 3 == 0) {
+            return "Fizz";
+        } else if (_number % 5 == 0) {
+            return "Buzz";
+        } else {
+            return "Splat";
+        }
+    }
+
+    function doNotDisturb(uint256 _time) public pure returns (string memory result) {
+        assert(_time < 2400);
+
+        if (_time > 2200 || _time < 800) {
+            revert AfterHours(_time);
+        } else if (_time >= 1200 && _time <= 1299) {
+            revert("At lunch!");
+        } else if (_time >= 800 && _time <= 1199) {
+            return "Morning!";
+        } else if (_time >= 1300 && _time <= 1799) {
+            return "Afternoon!";
+        } else if (_time >= 1800 && _time <= 2200) {
+            return "Evening!";
+        }
+    }
+}