Implementing DELETE user

The first thing we want to do to delete a user is to create a method for the User struct. Let's look at the steps:

1. Write the method to delete a user in the impl User block in src/models/user.rs:

   pub async fn destroy(connection: &mut PgConnection, uuid: &str) -> Result<(), Box<dyn Error>> {
       let parsed_uuid = Uuid::parse_str(uuid)?;
       let query_str = "DELETE FROM users WHERE uuid = 
       $1";
       sqlx::query(query_str)
           .bind(parsed_uuid)
           .execute(connection)
           .await?;
       Ok(())
   }

Then, we can implement the delete_user() function in src/routes/user.rs:

#[delete("/users/<uuid>", format = "application/x-www-form-urlencoded")]
pub async fn...