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