input: Write a Python function that sorts a list of tuples based on the float values in the second element of each tuple.
  assert float_sort([('itemA', '12.20'), ('itemB', '15.10'), ('itemC', '24.5')])==[('itemC', '24.5'), ('itemB', '15.10'), ('itemA', '12.20')] 
  assert float_sort([('itemA', '15'), ('itemB', '10'), ('itemC', '20')])==[('itemC', '20'), ('itemA', '15'), ('itemB', '10')] 
  assert float_sort([('itemA', '5'), ('itemB', '10'), ('itemC', '14')])==[('itemC', '14'), ('itemB', '10'), ('itemA', '5')]
output: def float_sort(lst):
      return sorted(lst, key=lambda x: float(x[1]), reverse=True)