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## prev_prime
### Instructions
Write a **function** which returns the first prime number which is equal or inferior to the `u64` passed as parameter.
If there are no primes inferior to the `u64` passed as parameter the function should return `0`.
### Expected function
```rust
pub fn prev_prime(nbr: u64) -> u64 {
}
```
### Usage
4 years ago
Here is a possible program to test your function :
```rust
fn main() {
println!("The previous prime number before 34 is: {}", prev_prime(34));
}
```
And its output :
```console
$ cargo run
The previous prime number before 34 is: 31
$
```