aggiunta la gestione errori

dopo 20sec si killa se bloccato dopo il timeout

counter.go

@@ -39,10 +39,10 @@ func (c *Counter) AddUser() {
 }
 
 // AddDuplicate increment number of duplicates log
-func (c *Counter) AddDuplicate() {
+func (c *Counter) AddDuplicate(add int) {
 	c.mu.Lock()
 	defer c.mu.Unlock()
-	c.dup++
+	c.dup += add
 }
 
 // AddLog increment number of log's rows managed
@@ -67,10 +67,10 @@ func (c *Counter) AddWG() {
 }
 
 // AddErr ...
-func (c *Counter) AddErr() {
+func (c *Counter) AddErr(add int) {
 	c.mu.Lock()
 	defer c.mu.Unlock()
-	c.err++
+	c.err += add
 }
 
 // DelWG ...