On a vacation abroad, you see a souvenir shop and decide to head inside. There are snow globes, postcards, fridge magnets and all the other goodies you'd typically find.
Given a list of prices of things in the store and the amount of money you have, return the maximum number of items you could possibly buy.
maximum_items(["$1", "$1", "$2"], "$3") ➞ 2
maximum_items(["$10", "$7", "$2", "$60"], "$20") ➞ 3
maximum_items(["$15", "$5", "$30", "$30", "$10"], "$2") ➞ "Not enough funds!"
"Not enough funds!"