input: Write a python function to join elements of a list into a single string with commas.
  assert join_elements_with_commas([1, 2, 3, 4, 5]) == "1,2,3,4,5"
  assert join_elements_with_commas(['a', 'b', 'c']) == "a,b,c"
  assert join_elements_with_commas([True, False, True]) == "True,False,True"
output: def join_elements_with_commas(elements):
      return ",".join(map(str, elements))