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## vector_operations
### Instructions
Define the structure `ThreeDvector` that represents a 3 dimensional vector in (for convention in physics the vector are represented as ai + bj + ck where a, b, and c are real numbers and i, j and k represent the direction x,y and z respectively in the Cartesian plane there for we use the names i, j and k for the fields in the ThreeDVector structure
Look how the operations Addition and Subtraction work for a 3 dimensional vector and implement them by implementing the std::ops::Add and std::ops::Sub traits
### Expected Functions and Structures
```rust
#[derive(Debug, Copy, Clone, PartialEq)]
pub struct ThreeDVector<T> {
pub i: T,
pub j: T,
pub k: T,
}
use std::ops::{Add, Sub};
impl Add for ThreeDVector<T> {
}
impl Sub for ThreeDVector<T> {
}
```
### Usage
Here is a program to test your function.
```rust
use vector_operations::ThreeDVector;
fn main() {
let a = ThreeDVector { i: 3, j: 5, k: 2 };
let b = ThreeDVector { i: 2, j: 7, k: 4 };
println!("{:?}", a + b);
}
```
And its output
```console
student@ubuntu:~/vector_operations/test$ cargo run
ThreeDVector { i: 5, j: 12, k: 6 }
student@ubuntu:~/vector_operations/test$
```