Fix stream-toarray-typed: old code missing filter(length > 3)

[Copilot]

The oldCode example for stream-toarray-typed was not functionally equivalent to modernCode — it copied all elements unconditionally while the modern version filters by n.length() > 3.

Change

Updated oldCode to use the pre-Streams idiomatic equivalent with an explicit filter loop:

// Before — missing the filter entirely
List<String> list = getNames();
String[] arr = new String[list.size()];
for (int i = 0; i < list.size(); i++) {
    arr[i] = list.get(i);
}

// After — functionally equivalent to the modern stream pipeline
List<String> list = getNames();
List<String> filtered = new ArrayList<>();
for (String n : list) {
    if (n.length() > 3) {
        filtered.add(n);
    }
}
String[] arr = filtered.toArray(new String[0]);

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