Skyscraper is a program for working with board NxN for playing a game!
Module consists of 7 different functions (read_input, left_to_right_check, check_not_finished_board, check_uniqueness_in_rows, check_horizontal_visibility, check_columns, check_skyscrapers), the first one is for reading a file, the last one is a main one and the other are for working with given data.