package q71

import "strings"

func simplifyPath(path string) string {
	b := strings.Builder{}
	fields := strings.FieldsFunc(path, func(r rune) bool { return r == '/' })

	p := 0
	for i := range fields {
		switch fields[i] {
		case ".":
			continue
		case "..":
			p = max(p-1, 0)
		default:
			fields[p] = fields[i]
			p++
		}
	}
	for i := range p {
		b.WriteByte('/')
		b.WriteString(fields[i])
	}

	if p == 0 {
		return "/"
	}
	return b.String()
}

var _ = simplifyPath