## profanity filter
### Instructions
Sometimes it is more desirable to catch the failure of some parts of a program instead of just calling panic.
For this exercise you will have to create a message blocker, where you must block the word `stupid` .
You will have to create a structure called `Message` , this structure
must have the following elements:
- content: String
- user: String
The `struct` must also have a implementation of 2 **functions** associated with it:
- `new` , which initializes the structure
- `send_ms` , which only has its implementation type (**self**) as argument and returns an option:
- This function must return `None` if the content of the message is either **empty** or contains the word **stupid** . Otherwise it returns the content of the message.
You will have to create two more **functions** that are not associated with any structure:
- `check_ms` which:
- receives as parameters the reference to the structure `Message`
- and returns a tuple, containing a `bool` and a `string` :
- This function will execute the function `send_ms` and if the result of the option is `None` , it should return (false, "ERROR: illegal").Otherwise it returns `true` and the content of the message sent.
### Notions
- [Enum Definition ](https://doc.rust-lang.org/stable/book/ch06-01-defining-an-enum.html?highlight=option#the-option-enum-and-its-advantages-over-null-values )
### Expected Function
```rust
pub struct Message {
}
impl Message {
pub fn new(ms: String, u: String, t: String) -> Message {
}
pub fn send_ms(& self) -> Option< & str> {
}
}
pub fn check_ms(ms: & Message) -> (bool, & str) {
}
pub fn format_date() -> String {
}
```
### Usage
Here is a program to test your function
```rust
use profanity_filter::*;
fn main() {
let m0 = Message::new("hello there".to_string(), "toby".to_string(), format_date());
println!("{:?}", check_ms(&m0));
let m1 = Message::new("".to_string(), "toby".to_string(), format_date());
println!("{:?}", check_ms(&m1));
let m2 = Message::new("you are stupid".to_string(), "toby".to_string(), format_date());
println!("{:?}", check_ms(&m2));
let m3 = Message::new("stupid".to_string(), "toby".to_string(), format_date());
println!("{:?}", check_ms(&m3));
}
```
And its output:
```console
student@ubuntu:~/profanity_filter/test$ cargo run
(true, "hello there")
(false, "ERROR: illegal")
(false, "ERROR: illegal")
(false, "ERROR: illegal")
student@ubuntu:~/profanity_filter/test$
```
