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head_dostream = head_dostream->prev;url = head_dostream->url;
head_dostream = head_dostream->prev;
url = head_dostream->url;
Apa error handling yang harus ditambahkan di sini?
Mengecek apakah head_dostream bernilai nullptr sebelum diakses
head_dostream
nullptr
Mengecek apakah url kosong
url
Mengecek apakah head_dostream punya next
next
Mengecek apakah url sudah ada di list
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