Exercise: swap

Write a function func swap(a, b *int) that swaps the values of the variables a and b point to. Then write a function func sortPair(a, b *int): after it, the smaller of the two values is in *a and the larger one is in *b.

• x, y := 1, 2, then swap(&x, &y) → x is 2, y is 1
• x, y := -3, 7, then swap(&x, &y) → x is 7, y is -3
• x, y := 5, 2, then sortPair(&x, &y) → x is 2, y is 5

Constraints: the pointers are not nil; a and b may point to the same variable, and then its value does not change; sortPair leaves an ordered pair as it is.

Do not add extra imports unless the task says so explicitly.