Implement get$\_$seconds

The function

needs to get the

seconds, minutes, and hours from the ISO $8601$

string, and then convert everything to seconds. That

is why we have created several helpers $-$ one for

each part of the string.

The first function to focus on is get$\_$seconds. We

could have started with any of the helpers, but it is

best to choose this function because it is the first

one tested in the test script. In fact, we should

always use the test script as a guide for

implementing our functions. Implement this

function now. If you think about the precondition,

you should be able to implement this in a single

line. However, note that this function returns an

and not a $.$ Think about how you can

convert types.

When you are done, run the test script. If you

implemented it correctly, you should pass all of the

test cases for

but fail the tests for

Check get$\_$seconds

You may run this test multiple times.