Pinpoint a Commit

Find when a line of code was introduced.

A intermediate Git challenge worth 10 points. Solve it hands-on in a real Git environment in your browser - no local setup, no fake shells.

The Challenge

Scenario: Someone added the function processPayment somewhere in app.txt's history.

Task: Find the commit that introduced it and write its short hash to /tmp/answer.txt (git log -S).