challenge3.go

func decoder(str string) string {
	key := ""
	best := ""
	var max float32 = 0
	for i := 0x00; i < 0xFF; i++ {
		key = fmt.Sprintf("%c", i)
		decodedHex := xorStrToChar(str, key)
		decodedAscii := hexToAscii(decodedHex)
		if max < rateString(decodedAscii) {
			max = rateString(decodedAscii)
			best = decodedAscii
		}
	}
	if max > 1.5 {
		return best
	} else {
		return ""
	}
}