removing magic numbers

src/main.cpp

@@ -8,15 +8,14 @@
 int main () {	
 	std::srand(std::time(0));
 	Window window;
-	const int MAX_LEN = (ROW * COL) + 3;
 	bool running = true;
 	Point* buffer[MAX_LEN] = {}; // 2 for head, 1 for fruit, rest for tail
 
-	buffer[0] = new Point { ROW / 2, COL / 2, '*' }; // Head
-	buffer[1] = new Point { buffer[0]->m_row, buffer[0]->m_col, '.' };
-	buffer[2] = new Point { (rand() % ROW), (rand() % COL), 'o' }; // Fruit
+	buffer[HEAD] = new Point { ROW / 2, COL / 2, '*' }; // Head
+	buffer[PREVIOUS_HEAD] = new Point { buffer[HEAD]->m_row, buffer[HEAD]->m_col, '.' };
+	buffer[FRUIT] = new Point { (rand() % ROW), (rand() % COL), 'o' }; // Fruit
 
-	std::thread input_thread([&] { get_input(buffer[0]->m_dir, running ); } ); 
+	std::thread input_thread([&] { get_input(buffer[HEAD]->m_dir, running ); } ); 
 
 	while (running) {
 		on_fruit_eaten(window.m_board, buffer);