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## nextprime
### Instructions
Create a **function** which returns the first prime number which is greater than or equal to the `u64` passed as an argument.
The function must be optimized, so as to avoid time-outs.
> We consider that only positive numbers can be prime numbers.
### Expected function
```rust
pub fn next_prime(nbr: u64) -> u64 {
}
```
### Usage
Here is a possible program to test your function :
```rust
fn main() {
println!("The next prime after 4 is: {}", next_prime(4));
println!("The next prime after 11 is: {}", next_prime(11));
}
```
And its output :
```console
$ cargo run
The next prime after 4 is: 5
The next prime after 11 is: 11
$
```