input: Write a function to check if a number is within a given range.
  assert is_in_range(3, 1, 10) == True
  assert is_in_range(10, 1, 10) == True
  assert is_in_range(1, 1, 10) == True
  assert is_in_range(0, 1, 10) == False
  assert is_in_range(11, 1, 10) == False
output: def is_in_range(number, start, end):
      return start <= number <= end