input: Write a function to check if an element exists within a given list of integers. If the element exists return True else return False. If the given list is empty then return False.
  assert element_exists(3, [1, 2, 3, 4, 5]) == True
  assert element_exists(10, [1, 2, 3, 4, 5]) == False
  assert element_exists(1, []) == False
output: def element_exists(element, lst):
      return element in lst