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Collections are a way for you to organize kata so that you can create your own training routines. Every collection you create is public and automatically sharable with other warriors. After you have added a few kata to a collection you and others can train on the kata contained within the collection.
Get started now by creating a new collection.
In general it's a bad practice to mutate the input. In some katas it doesn't make a problem, but it does in others. If you have weird/ununderstandable results it's something to check out prioritarily.
An error message, as it says, due to a syntax error, the compiler/interpreter finds the end of code while it should not. Most probably a bug in your code. Always say which language you're using (I guess JavaScript).
First, read this: https://docs.codewars.com/training/troubleshooting/
About your problem: your function is returning
'There will be no Python developers'if the first developer's language isn't Python.