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## handling
### Instructions
Write a **function**, called `open_or_create` which has two arguments:
- `file : &str` which is the name of the file
- `content: &str` which will be the content to be written into the file
This function should try to open a file, if it does not exist, it should create it.
In case something goes wrong, it should panic, with the error.
### Notions
- [Error kind](https://doc.rust-lang.org/std/io/enum.ErrorKind.html)
- [struct file](https://doc.rust-lang.org/std/fs/struct.File.html)
- [OPenOptions](https://doc.rust-lang.org/std/fs/struct.OpenOptions.html)
### Expected Function
```rust
pub fn open_or_create(s: &str, content: &str) {
}
```
### Usage
Here is a program to test your function
```rust
use std::fs::File;
use std::io::Read;
use handling::*;
fn main() {
let path = "a.txt";
File::create(path).unwrap();
open_or_create(path, "content to be written");
let mut file = File::open(path).unwrap();
let mut s = String::new();
file.read_to_string(&mut s).unwrap();
println!("{}", s);
}
```
And its output:
```console
student@ubuntu:~/handling/test$ cargo run
content to be written
student@ubuntu:~/handling/test$
```