## Rectangle
### Instructions
Consider that a point is defined by its coordinates and that a rectangle
is defined by the points of the upper left and lower right corners.
- Define two structures named, `point` and `rectangle` .
- The struct `point` has to have two variables, `x` and `y` , type `int` .
- The struct `rectangle` has to have two variables, `upLeft` and `downRight` type `point` .
- The goal is to make a program that:
- Given a slice of points of size `n` returns the smallest rectangle that contains all the points in the vector of points. The name of that function is `defineRectangle` .
- And which calculates and prints the area of that rectangle you define.
### Expected main and function for the program
```go
func defineRectangle(ptr *point, n int) *rectangle {
}
func calArea(ptr *rectangle) int {
}
func main() {
vPoint := []point{}
rectangle := & rectangle{}
n := 7
for i := 0; i < n ; i + + {
val := point{
x: i%2 + 1,
y: i + 2,
}
vPoint = append(vPoint, val)
}
rectangle = defineRectangle(vPoint, n)
fmt.Println("area of the rectangle:", calArea(rectangle))
}
```
### Expected output
```console
student@ubuntu:~/piscine-go/test$ go build
student@ubuntu:~/piscine-go/test$ ./test
area of the rectangle: 6
student@ubuntu:~/piscine-go/test$
```
