feat: add utility function to log caller information and clean up handler

cmn/utils/utils.go

@@ -0,0 +1,21 @@
+package utils //nolint:revive
+
+import (
+	"fmt"
+	"runtime"
+)
+
+// Fnc prints the caller function name, file and line number.
+func Fnc() {
+	pc, file, line, ok := runtime.Caller(1)
+	if !ok {
+		fmt.Println("unable to get caller")
+		return
+	}
+	fn := runtime.FuncForPC(pc)
+	name := "unknown"
+	if fn != nil {
+		name = fn.Name()
+	}
+	fmt.Printf("%s %s:%d <----\n", name, file, line)
+}