improve Prefix function

Author: MatusOllah

prefix.go

@@ -1,10 +1,16 @@
 package slogcolor
 
 import (
+	"strings"
+
 	"github.com/fatih/color"
 )
 
 // Prefix prepends a colored prefix to msg.
-func Prefix(prefix string, msg string) string {
-	return color.New(color.BgHiWhite, color.FgBlack).Sprint(prefix) + " " + msg
+func Prefix(prefix string, msg ...string) string {
+	if len(msg) == 0 {
+		return color.New(color.BgHiWhite, color.FgBlack).Sprint(prefix)
+	}
+
+	return color.New(color.BgHiWhite, color.FgBlack).Sprint(prefix) + " " + strings.Join(msg, " ")
 }