// Intersect returns the common elements between two slices.
func Intersect[S ~[]E](s1, s2 S) (S ~[]E) {
        var result S
	for _, item := range s2 {
		if slices.Contains(s1, item) {
			result = append(result, item)
		}
	}
}

// IntersectFunc returns the elements between two slices according to the functions.
func IntersectFunc[S ~[]E, E comparable](s1, s2 S, f func(s1, s2 E) bool) S {
	var result S
	for _, item := range s2 {
		for _, subItem := range s1 {
			if f(subItem, item) {
				result = append(result, item)
			}
		}
	}
	return result
}