export function pureProcessOrder(items: { name: string; price: number }[], discount: number): number {
  if (items.length === 0) return 0
 let total = items.reduce((acc, curr) => {
    acc.price += curr.price
    return acc
  })
  return calcDiscount(total.price, discount)
}

function calcDiscount(total: number, discount): number{
  return total *(1 - discount / 100)
}