for i := 0; i < b.N; i++ {
					Trim(x[:k], cs[:j])
				}
			})
		}
	}
}

func BenchmarkTrimByte(b *testing.B) {
	x := []byte("  the quick brown fox   ")
	for i := 0; i < b.N; i++ {
		Trim(x, " ")
	}
}

func BenchmarkIndexPeriodic(b *testing.B) {
	key := []byte{1, 1}
	for _, skip := range [...]int{2, 4, 8, 16, 32, 64} {