X1664: unMakeCamelCase

Given a string, compute recursively a new string where uppercase letters in the original one are preceeded with a space in the new string.

All strings start with lowercase and might have some letters in uppercase. Detect the uppercase and insert a " ".

So given "helloWorld", return "hello World".

The method Character.isUpperCase(char) can be used to check if a letter is uppercase.

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