Check if interger is even using isevenapi.
``` // Cargo.toml: 'tokio = { version = "1.4.0", features = ["full"] }'
extern crate rustiseven as ie;
async fn main() -> Result<(), Box
let n: u32 = 42;
if ie::is_even(n).await? {
println!("{} is even", n);
} else {
println!("{} is odd", n);
}
Ok(())
} ```