finished the bulk of game

src/input.h

@@ -1,12 +1,13 @@
 #ifndef __INPUT_H__
 #define __INPUT_H__
 #include <string>
-#include "constants.h"
+
+enum game_command : int;
 
 class input {
 public:
-    virtual ~input() = default;
-    virtual game_command get_command() = 0;
+        virtual ~input() = default;
+        virtual game_command get_command() = 0;
 };
 
 game_command get_direction(std::string &str);