Refactor functions into Calculator class

- Add Calculator class with add and multiply methods
- Maintain original functions for compatibility
- Update test code to use class interface

test.py

@@ -1,3 +1,14 @@
+class Calculator:
+    """A calculator class that provides basic arithmetic operations."""
+
+    def add(self, a, b):
+        """Return the sum of two numbers."""
+        return a + b
+
+    def multiply(self, a, b):
+        """Return the product of two numbers."""
+        return a * b
+
 def add_two_numbers(a, b):
     """Return the sum of two numbers."""
     return a + b
@@ -7,9 +18,17 @@ def multiply_two_numbers(a, b):
     return a * b
 
 if __name__ == "__main__":
-    # Example usage
-    sum_result = add_two_numbers(5, 3)
+    # Example usage with the Calculator class
+    calc = Calculator()
+
+    # Test addition using Calculator class
+    sum_result = calc.add(5, 3)
     print(f"The sum is: {sum_result}")
 
-    product_result = multiply_two_numbers(5, 3)
-    print(f"The product is: {product_result}")
+    # Test multiplication using Calculator class
+    product_result = calc.multiply(5, 3)
+    print(f"The product is: {product_result}")
+
+    # Also test the original functions for compatibility
+    print(f"Function add result: {add_two_numbers(5, 3)}")
+    print(f"Function multiply result: {multiply_two_numbers(5, 3)}")