package main

import (
	"fmt"
	"strings"
)

func main() {
	a("1a", "2b", 3, 4, 5, 6, 7, 8)
	println(format(" alan turing ", trim, last, strings.ToUpper))
	println(strings.ToUpper(last(trim(" alan turing "))))
}

func a(q, w string, v ...int) {
	summ := 0
	for _, vv := range v {
		summ += vv
	}
	fmt.Printf("%s %s == %d\n", q, w, summ)
}

type formatter func(s string) string

func trim(s string) string {
	return strings.Trim(s, " ")
}
func last(s string) string {
	return s[strings.LastIndexByte(s, ' ')+1 : len(s)]
}

func format(s string, fmtrs ...formatter) string {
	for _, fmtr := range fmtrs {
		s = fmtr(s)
	}
	return s
}