article = "an"
	}

	return fmt.Sprintf("%s%s%s", padding, article, padding)
}

// isVowel returns true if the rune is a vowel (case insensitive).
func isVowel(c rune) bool {
	vowels := []rune{'a', 'e', 'i', 'o', 'u'}
	for _, value := range vowels {
		if value == unicode.ToLower(c) {
			return true
		}
	}
	return false
}

    // non-breaking space
    assertThat(parse("http://h/\u00a0").encodedPath).isEqualTo("/%C2%A0")
    // ogham space mark
    assertThat(parse("http://h/\u1680").encodedPath).isEqualTo("/%E1%9A%80")
    // mongolian vowel separator
    assertThat(parse("http://h/\u180e").encodedPath).isEqualTo("/%E1%A0%8E")
    // en quad
    assertThat(parse("http://h/\u2000").encodedPath).isEqualTo("/%E2%80%80")
    // em quad