input: Write a python function to print "Welcome" n times using a for loop.
  assert print_welcome(3) == "Welcome\nWelcome\nWelcome\n"
  assert print_welcome(1) == "Welcome\n"
  assert print_welcome(5) == "Welcome\nWelcome\nWelcome\nWelcome\nWelcome\n"
output: def print_welcome(n):
      result = ""
      for _ in range(n):
          result += "Welcome\n"
      return result