3D models test

Answer guidance

Reference solution: NO_OF_CHARS = 256 def str_to_list(string): temp = [] for x in string: temp.append(x) return temp def lst_to_string(List): return ''.join(List) def get_char_count_array(string): count = [0] * NO_OF_CHARS for i in string: count[ord(i)] += 1 return count def remove_dirty_chars(string, second_string): count = get_char_count_array(second_string) ip_ind = 0 res_ind = 0 temp = '' str_list = str_to_list(string) while ip_ind != len(str_list): temp = str_list[ip_ind] if count[ord(temp)] == 0: str_list[res_ind] = str_list[ip_ind] res_ind += 1 ip_ind+=1 return lst_to_string(str_list[0:res_ind])