Remove type annotation for pivot variable

Author: ThijsRay

contents/graham_scan/code/rust/graham_scan

@@ -19,7 +19,7 @@ fn graham_scan(mut points: Vec<Point>) -> Vec<Point> {
     sort_based_on_lowest_coordinate(&mut points);
 
     // Take ownership of the pivot point
-    let pivot: Point = points.remove(0);
+    let pivot = points.remove(0);
 
     // Sort all points based on the angle between the pivot point and itself
     &mut points