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## ordinal
### Instructions
Complete the function "num_to_ordinal" that receives a cardinal number and returns its ordinal number.
### Expected functions
```rust
pub fn num_to_ordinal(x: u32) -> String {}
```
### Usage
Here is a program to test your function.
```rust
use ordinal::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
student@ubuntu:~/[[ROOT]]/test$ cargo run
1st
22nd
43rd
47th
student@ubuntu:~/[[ROOT]]/test$
```