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## generics
### Instructions
Write a **function** called `identity` which calculates the identity of a value (receives any data type and returns the same value).
### Expected Function (signature to be completed)
```rust
pub fn identity(v: _) -> _ {
}
```
### Usage
Here is a program to test your function.
```rust
use generics::*;
fn main() {
println!("{}", identity("Hello, world!"));
println!("{}", identity(3));
}
```
And its output:
```console
$ cargo run
Hello, world!
3
$
```