num_of_digits(1000) ➞ 4

num_of_digits(12) ➞ 2

num_of_digits(1305981031) ➞ 10

num_of_digits(0) ➞ 1

def num_of_digits(n):
    return next(i for i in range(1, 100) if abs(n) < 10**i)

correct_spacing("The film   starts       at      midnight. ")
➞ "The film starts at midnight."

correct_spacing("The     waves were crashing  on the     shore.   ")
➞ "The waves were crashing on the shore."

correct_spacing(" Always look on    the bright   side of  life.")
➞ "Always look on the bright side of life."

best_friend("he headed to the store", "h", "e") ➞ True
# Вхождения "h": ["he", "headed", "the"]
# После всех вхождений "h" идет буква "e".
# Возвращается True