Fixed GetPrefix function at multiplexer.

Multiplexer/GetPrefix.go

 package multiplexer
 
-import (
-	"encoding/json"
-	"fmt"
-	"io/ioutil"
-)
-
 var (
 	BotPrefix string        // BotPrefix is bot's prefix to cut prefix's length
 	config    *configStruct // config structure
@@ -15,23 +9,7 @@ type configStruct struct {
 	BotPrefix string `json:"BotPrefix"`
 }
 
-// GetPrefix returns to Bot's prefix from config.json file
+// GetPrefix returns to Bot's prefix from config package
 func GetPrefix() string {
-	file, err := ioutil.ReadFile("./config.json")
-
-	if err != nil {
-		fmt.Println(err.Error())
-		return "err"
-	}
-
-	err = json.Unmarshal(file, &config)
-
-	if err != nil {
-		fmt.Println(err.Error())
-		return "err"
-	}
-
-	BotPrefix = config.BotPrefix
-
-	return BotPrefix
+	return config.BotPrefix
 }