fix(v3 client): topic length mismatch on matching topics

shard.yml

@@ -1,5 +1,5 @@
 name: mqtt
-version: 1.2.0
+version: 1.2.1
 crystal: ">= 0.36.1"
 
 authors:

src/mqtt/v3/client.cr

@@ -18,11 +18,11 @@ module MQTT
         # https://emqx.medium.com/introduction-to-mqtt-5-0-protocol-shared-subscription-4c23e7e0e3c1
         filter_array = filter_array[2..-1] if filter_array.first? == "$share"
         topic_array = topic.split("/")
-        length = filter_array.size
 
         # Normalise the strings
-        filter_array.shift if filter_array[0].empty?
         topic_array.shift if topic_array[0].empty?
+        filter_array.shift if filter_array[0].empty?
+        length = filter_array.size
 
         filter_array.each_with_index do |left, index|
           right = topic_array[index]?

src/mqtt/v3/connack.cr

@@ -32,7 +32,7 @@ module MQTT
 
       def success!
         return self if success?
-        raise (REFUSAL_CODES[return_code]? || "Connection refused: error code #{return_code}")
+        raise(REFUSAL_CODES[return_code]? || "Connection refused: error code #{return_code}")
       end
     end
   end # V3