Time: 0:00
Test a custom input to verify an edge case (e.g. empty lists, negative numbers, duplicates).
This bug belongs to the mutation and copying bugs pattern
Assignment does not copy, a shallow copy still shares its contents, and mutating methods return None.
What went wrong: toUpperCase() returns a new string, but the code throws it away.
The fix: return text.toUpperCase() + "!";
Remember: string methods never change the original. Use what they return.
The pattern behind it: mutation and copying bugs.
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