### Vertex Shader Challenge

A shader program is made of two sub-functions: a **vertex** and a **fragment shader**.

Both the vertex and fragment shader are written using **OpenGL Shading Language (GLSL)** and require a function called `main` in order to work:

```
void main() {

}
```

Let's start easy—replicate the above `main` function below:

vertex-glsl

// Write your function below