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## easy_traits
### Instructions
Your task is to implement the trait `AppendStr` for the type `StringValue`.
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The trait `AppendStr` has the following functions:
- `append_str`: that appends the string to the `value`.
- `append_number`: that appends the number to the `value`.
- `remove_punctuation_marks`: that removes punctuation from the `value` (`.`, `,`, `?` and `!`).
### Expected Function
```rust
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#[derive(Clone)]
pub struct StringValue {
pub value: String,
}
pub trait AppendStr {
fn append_str(&mut self, str_to_append: String) -> Self;
fn append_number(&mut self, nb_to_append: f64) -> Self;
fn remove_punctuation_marks(&mut self) -> Self;
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}
impl AppendStr for StringValue {
}
```
### Usage
Here is a program to test your function.
```rust
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use easy_traits::*;
fn main() {
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let mut str_aux = StringValue {
value: String::from("hello"),
};
println!("Before append: {}", str_aux.value);
str_aux.append_str(String::from(" there!"));
println!("After append: {}", str_aux.value);
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str_aux.remove_punctuation_marks();
println!("After removing punctuation: {}", str_aux.value);
}
```
And its output
```console
$ cargo run
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Before append: hello
After append: hello there!
After removing punctuation: hello there
$
```