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## ordinal
### Instructions
Complete the function `num_to_ordinal`. It returns the ordinal number for a given cardinal number.
### Expected functions
```rust
4 years ago
pub fn num_to_ordinal(x: u32) -> String {
}
```
### Usage
Here is a program to test your function.
```rust
4 years ago
use ordinal::*;
fn main() {
println!("{}", num_to_ordinal(1));
println!("{}", num_to_ordinal(22));
println!("{}", num_to_ordinal(43));
println!("{}", num_to_ordinal(47));
}
```
And its output
```console
$ cargo run
1st
22nd
43rd
47th
$
```