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.
  assert remove_element([2, 4, 5, 7, 4, 2], 4)==[2, 5, 7, 2]
  assert remove_element([1, 2, 3, 2, 4], 2)==[1, 3, 4]
  assert remove_element([5, 5, 5, 5], 5)==[]
  assert remove_element([1, 3, 5, 7], 2)==[1, 3, 5, 7]
  assert remove_element([], 4)==[]
output: def remove_element(arr, element):
      return [x for x in arr if x != element]