input: Write a function to determine if an element exists within a given list of integers. The function should return True if the element is found in the list, otherwise return False. If the list is empty, return False.
  assert element_exists(3, [1, 2, 3])==True
  assert element_exists(4, [1, 2, 3])==False
  assert element_exists(1, [])==False
  assert element_exists(5, [5, 5, 5])==True
output: def element_exists(element, lst):
      return element in lst