Update value.h

Author: AzliRynz

value.h

@@ -16,6 +16,8 @@ typedef enum {
 } ValueType;
 #endif
 
+typedef struct Value Value;
+
 typedef struct Object {
     struct Object* next;
     bool marked;
@@ -56,7 +58,7 @@ typedef struct {
 #define AS_STRING(v) ((v).data.str_val)
 #define AS_OBJ(v) ((v).data.obj)
 
-void print_value(Value* value);
+void print_value(Value value);
 void* reallocate(void* pointer, size_t oldSize, size_t newSize);
 
 #endif