input: Write a function to remove all occurrences of the given element in a given array. If the given array is empty then return an empty array.
  remove_element(arr, element)
  assert remove_element([2, 4, 5, 7, 4, 2], 4) == [2, 5, 7, 2]
  assert remove_element([2, 4, 5, 7, 4, 2], 2) == [4, 5, 7, 4]
  assert remove_element([4, 4, 4, 4], 4) == []
  assert remove_element([], 2) == []
  assert remove_element([1, 2, 3, 4], 5) == [1, 2, 3, 4]
output: def remove_element(arr, element):
      return [x for x in arr if x != element]