trimEmptyLinesFromEnd (made with https://codeeval.dev)

main.go

package main

import (
	"fmt"
	"strings"
)

func trimEmptyLinesFromEnd(a []string) []string {
	for len(a) > 0 {
		lastIdx := len(a) - 1
		s := strings.TrimSpace(a[lastIdx])
		if len(s) > 0 {
			return a
		}
		a = a[:lastIdx]
	}
	return a
}

func main() {
	a := []string{"a", "b", "", ""}
	fmt.Printf("before: %#v\n", a)
	a = trimEmptyLinesFromEnd(a)
	fmt.Printf("after: %#v\n", a)	
}