input: Write a function to take an array of integers and calculate the sum of squares of all numbers provided in the array. The function should return the sum of squares of the array elements. If the array is empty, the function should return 0.
  assert sum_squares([2, 3, 4])==29
  assert sum_squares([1, 2, 3])==14
  assert sum_squares([0])==0
  assert sum_squares([4, 5])==41
  assert sum_squares([])==0
output: def sum_squares(arr):
      return sum(x**2 for x in arr)