Simple Go loop

Trying to go through a few examples. All of my programming work in school has involved Java so Go is a little different. That being said, I would love if someone could help me solve the simple exercise below...

Update the CountByThrees function so that it counts from start up to end, skipping 3 each time. Print each number on a separate line. For example, CountByThrees(3, 9) should print:

3

6

9

What I have is...

package loops

import "fmt"

func CountByThrees(start int, end int) { if (i := start; i <= end; i += 3) { fmt.Println(i) } }