input: Write a function to print the numbers from 1 to 50, but for multiples of 3 print "Fizz" instead of the number, for multiples of 5 print "Buzz" instead of the number, and for multiples of both 3 and 5 print "FizzBuzz".
  
  assert fizz_buzz() == """1
  2
  Fizz
  4
  Buzz
  Fizz
  7
  8
  Fizz
  Buzz
  11
  Fizz
  13
  14
  FizzBuzz
  16
  17
  Fizz
  19
  Buzz
  Fizz
  22
  23
  Fizz
  Buzz
  26
  Fizz
  28
  29
  FizzBuzz
  31
  32
  Fizz
  34
  Buzz
  Fizz
  37
  38
  Fizz
  Buzz
  41
  Fizz
  43
  44
  FizzBuzz
  46
  47
  Fizz
  49
  Buzz"""
  
output: def fizz_buzz():
      result = []
      for i in range(1, 51):
          if i % 3 == 0 and i % 5 == 0:
              result.append("FizzBuzz")
          elif i % 3 == 0:
              result.append("Fizz")
          elif i % 5 == 0:
              result.append("Buzz")
          else:
              result.append(str(i))
      return "\n".join(result)