map validation

[inticoy]

• The map must be rectangular
• The map must be closed/surrounded by walls
• You have to check if there's a valid path in the map
• You must be able to parse any kind of map, as long as it respects the above rules.
• If any misconfiguration of any kind is encountered in the file, the program must exit in a clean way, and return "Error\n" followed by an explicit message of your choice.

[inticoy]

1. Open map file by "open"
   -> if return value of O_DIRECTORY > 0 : directory
   -> if return value of O_RDONLY < 0 : unavailable
2. Get number of lines of map file by "get_num_line(path)"
3. malloc char **
4. while get_next_line
5. check rectangular
6. check closed by walls
7. check E, P, C
8. check valid path