const may not be correct afterall. #13

If the user is using a mutable lambda. Then they can't use the algorithm. So might need to remove const from these.

We might want to test a mutable lambda to see if it's working as expected. like [x=0] and ++x to make sure all the functions are correctly incrementing the value.

Though it should be fine I did some testing with compiler explorer. So I understand. The last function in the call will get the one that will increment because they are all pass by value.