Add solution and tests for prime_number_of_divisors
Add solution and tests for wc
Add solution and tests for sort_fractions
Add solution and tests for nth_fibonacci
Add solution and tests for unique_words_count
Add solution and tests for generate_numbers
Add solution and tests for biggest_difference
Add solution and tests for cat2
Add solution and tests for count_substrings
Add solution and tests for is_decreasing
Add solution and tests for count_vowels
Add solution and tests for contains_digits
Add solution and tests for calculate_coins
Add solution and tests for is_increasing
Add solution and tests for reduce_file_path
Add solution and tests for sum_of_digits
Add solution and tests for sevens_in_a_row
Add solution and tests for slope_style_score
Add solution and tests for is_number_balanced
Add solution and tests for sum_of_divisors