snake can collide and removed some magic numbers

include/element.hpp

@@ -3,20 +3,28 @@
 
 #include "globals.hpp"
 
+enum Direction {
+	NONE = 0,
+	UP = -2,
+	DOWN = 2,
+	LEFT = -1,
+	RIGHT = 1
+};
+
 struct Point {
 	int m_row;
 	int m_col;
 	char m_symbol;
-	int m_direction;
+	enum Direction m_dir;
 	Point() : m_row(-1), m_col(-1), m_symbol('@') {}
 	Point(int x, int y, char s) : m_row(x), m_col(y), m_symbol(s) {}
-	Point(int x, int y, char s, int d) : m_row(x), m_col(y), m_symbol(s), m_direction(d) {}
-	void to_string();
 	void set_new_point(int row, int col);
 };
 
+int get_score();
 void determine_index_zero_pos(Point* (*board)[COL], Point** segments);
 void move_tail_indicies(Point** segments);
 void on_fruit_eaten(Point* (*board)[COL], Point** segments);
+bool segment_overlap(Point** segments);
 
 #endif // ELEMENT_HPP