Add Numbers

Create a function called add that takes two i32 parameters and returns their sum. Then call it from main and print the result.

Expected output:

3 + 5 = 8

Hints:

• Define with fn add(a: i32, b: i32) -> i32
• The last expression without a semicolon is the return value: a + b
• In main, use println!("3 + 5 = {}", add(3, 5));