chore: Add logic for put and get by id handler

backend/internal/handlers/registry_handlers.go

@@ -13,9 +13,9 @@ func Register(router *gin.Engine, db *sql.DB) {
 	posts := v1.Group("posts")
 	{
 		posts.GET("/", handler_posts.GetPosts)
-		posts.GET("/:id", GetPost)
+		posts.GET("/:id", handler_posts.GetPost)
 		posts.POST("/", handler_posts.CreatePost)
-		posts.PUT("/:id", UpdatePost)
+		posts.PUT("/:id", handler_posts.UpdatePost)
 		posts.DELETE("/:id", DeletePost)
 	}
 }