Which way does the water move?

A red blood cell holds about $0.9$ per cent salt. You will write a function that says which way water moves when a cell sits in a solution, then use it on four solutions.

The idea. In osmosis, water moves towards the more concentrated side. If the outside is more concentrated, water leaves the cell and it shrinks. If the inside is more concentrated, water enters.

Your tasks.

1. In water_moves, return "into the cell", "out of the cell" or "no net movement", from the two concentrations.
2. Set moves to a dictionary from each solution's name to the result for the cell.
3. Set shrinks to a list of the names of the solutions in which the cell shrinks.