Function intersect

pub fn intersect(arr1: Array, arr2: Array) -> Result<Array, Box<EvalAltResult>>

Performs set intersection of two arrays

 let set1 = [7, 1, 7, 7, 4];
 let set2 = [7, 0, 4, 4, 0];
let x = intersect(set1, set2);
assert_eq(x, [4, 7]);