I have a string `Topic: Computer Science`

And want to strip out topic: (but in fact I want this to work with any header on the string line) and return Computer Science.

I thought about splitting the components and then adding the spaces back in:

```
var subjectLine = thisLine.split(" ");

var subjectString = "";

for (i = 1; i < subjectLine.length; i++) {
    subjectString += subjectLine[i] + " ";
  }

```

But then I need to remove the last space from the string.

For each doesn't work as I need to NOT have the first element appended.

I'm not sure how to do this in js so it is reusable for many different lines and topic names that can come from the subjectLine