refactor

src/window.cpp

@@ -10,7 +10,7 @@ void Window::update_display(Fruit &fruit, Head &head, Body &body) {
 		}
 	}
 	m_board[head.m_head.m_row][head.m_head.m_col] = '*';
-	m_board[fruit.m_point.m_row][fruit.m_point.m_col] = 'X';
+	m_board[fruit.m_point.m_row][fruit.m_point.m_col] = 'o';
 	for(int i = 0; i < body.m_body.size(); i++) {
 		m_board[body.m_body.at(i).m_tail_pos.m_row][body.m_body.at(i).m_tail_pos.m_col] = '@';
 	}