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#ifndef _POINTER_H
#define _POINTER_H
typedef char *string;
string concat (string str1, string str2);
struct _Point {
int x, y;
};
struct _ColourPoint {
int x, y;
unsigned int colour;
};
typedef struct _Point Point;
typedef struct _ColourPoint ColourPoint;
typedef struct _Point *PointPtr;
Point *make_point (int x, int y);
Point *trans_point (Point *pnt, int x, int y);
typedef void (*FunPtrFun) (void *data);
typedef char **stringPtr;
#endif /* !_POINTER_H */
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