Instructions

In this exercise you're going to write some code to help Betty's Bike Shop, an online shop for bikes and parts. You have three tasks, aiming at correctly displaying the bikes and parts prices on the website.

1. Export the pence_to_pounds function

Your colleague has already written the skeleton of the module, the incomplete functions pence_to_pounds and pounds_to_string. However, they have forgotten to export the pence_to_pounds function, so it is currently not visible by other modules or by the test suite.

Export the pence_to_pounds function.

2. Convert pence to pounds

Currently, the price is stored as an integer number of pence (the bike shop is based in the UK). On the website, we want to show the price in pounds, where 1.00 pound amounts to 100 pence. Your first task is to implement the pence_to_pounds function, taking an Int amount of pence, and converting it into its equivalent pounds as a Float. You should also add type annotations for that function.

3. Format the price for display on the website

Since Betty's bikes are sold in pounds, prices should be displayed with the symbol "£". Your second task is thus to implement the pounds_to_string function, taking an amount of pounds as a Float and returning its price displayed as a String with the pound symbol prepended.

You should import the gleam/float and gleam/string modules before using them.

You should also define the type annotation for pounds_to_string.