rounding students grades hackerrank

grades.go

package main

import (
	"fmt"
)

func main() {
	grades := []int32{73, 67, 38, 33}
	fmt.Println(grades)

	ngrades := gradingStudents(grades)

	fmt.Println(ngrades)
}

func gradingStudents(grades []int32) []int32 {
	for i := 0; i < len(grades); i++ {
		grade := grades[i]
		next := ((grade / 5) + 1) * 5
		diff := next - grade

		if diff < 3 && grade > 38 {
			grades[i] = next
		}
	}

	return grades
}