input: Write a function to take an array of integers and calculate the sum of squares of all numbers provided in the array.
  assert sum_squares([2, 3, 4]) == 29
  assert sum_squares([1, 2, 3]) == 14
  assert sum_squares([0]) == 0
  assert sum_squares([-1, -2, -3]) == 14
  assert sum_squares([]) == 0
output: def sum_squares(arr):
      return sum(x ** 2 for x in arr)