Lesson 21 Strings, last example [step] executes all actions

[SchrodingerL10N]

Describe the bug In Lesson 21 Strings, clicking the [step] button executes the full string in one click just like [perform_combo()] does instead of executing one action per step clicked

To Reproduce Steps to reproduce the bug:

1. Go to last example in Lesson 21 Strings
2. Click on [step]
3. See error

Expected behavior After clicking [step] it should execute one action corresponding to the string each time it is clicked

Screenshots If applicable, drag and drop screenshots here to help explain your problem.

Information about your device (please complete the following information):

• Operating System: Windows 11
• Browser: Chrome Version 110.0.5481.178 (Official Build) (64-bit)

Additional context gdquest-1677975919049.log