fix: incorrect function definition in example code (#294)

* Fix incorrect function definition in example code

Replaces an anonymous function with a proper 'main' function in the Go code example to ensure correct usage and clarity for readers.

* feat: add contributor

---------

Co-authored-by: novalagung <hello@novalagung.com>

Author: refs05

content/C-golang-redis.md

@@ -66,7 +66,7 @@ Salah satu benefit yang didapat dengan menggunakan `go-redis` library, adalah su
 Ok, sekarang tambahkan kode berikut:
 
 ```go
-func () {
+func main() {
 	// ...
 
 	key := "key-1"

content/CONTRIBUTING.md

@@ -68,6 +68,7 @@ Berikut merupakan *hall of fame* kontributor yang sudah berbaik hati menyisihkan
 1. [nekonako](https://github.com/nekonako)
 1. [nisacodelifings](https://github.com/nisacodelifings)
 1. [Nuevo Querto](https://github.com/NuevoQuerto)
+1. [Restu Fajar Sidhiq](https://github.com/refs05)
 1. [Rico](https://github.com/goldsky)
 1. [Rizky Zhang](https://github.com/rizkyzhang)
 1. [Ryan Febriansyah](https://github.com/sodrooome)