old_contents: """ Multiply two numbers using Karatsuba algorithm """
  
  
  def karatsuba(a, b):
      """
      >>> karatsuba(15463, 23489) == 15463 * 23489
      True
      >>> karatsuba(3, 9) == 3 * 9
      True
      """
      if len(str(a)) == 1 or len(str(b)) == 1:
          return a * b
      else:
          m1 = max(len(str(a)), len(str(b)))
          m2 = m1 // 2
  
          a1, a2 = divmod(a, 10**m2)
          b1, b2 = divmod(b, 10**m2)
  
          x = karatsuba(a2, b2)
          y = karatsuba((a1 + a2), (b1 + b2))
          z = karatsuba(a1, b1)
  
          return (z * 10 ** (2 * m2)) + ((y - z - x) * 10 ** (m2)) + (x)
  
  
  def main():
      print(karatsuba(15463, 23489))
  
  
  if __name__ == "__main__":
      main()
  
new_contents: """ Multiply two numbers using Karatsuba algorithm """
  
  
  def karatsuba(a, b):
      """
      >>> karatsuba(15463, 23489) == 15463 * 23489
      True
      >>> karatsuba(3, 9) == 3 * 9
      True
      """
      if len(str(a)) == 1 or len(str(b)) == 1:
          return a * b
  
      m1 = max(len(str(a)), len(str(b)))
      m2 = m1 // 2
  
      a1, a2 = divmod(a, 10**m2)
      b1, b2 = divmod(b, 10**m2)
  
      x = karatsuba(a2, b2)
      y = karatsuba((a1 + a2), (b1 + b2))
      z = karatsuba(a1, b1)
  
      return (z * 10 ** (2 * m2)) + ((y - z - x) * 10 ** (m2)) + (x)
  
  
  def main():
      print(karatsuba(15463, 23489))
  
  
  if __name__ == "__main__":
      main()
  
subject: Remove unnecessary else statement (#7759)