chore: move var to after type definitions

main.go

@@ -14,15 +14,15 @@ import (
 	"github.com/gorilla/mux"
 )
 
-// Global counter
-var C counter
-
 // Counter mutex for counter
 type counter struct {
 	mu sync.Mutex
 	n  int
 }
 
+// Global counter
+var C counter
+
 // Add value to counter
 func (c *counter) Add() {
 	c.mu.Lock()