fix spell mistake
null To NULL
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e0e4e68e6e
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d123bbe279
@ -47,7 +47,7 @@ struct single_list* del(struct single_list **prev)
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if (!prev)
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return NULL;
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if (*prev == null)
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if (*prev == NULL)
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return NULL;
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tmp = *prev;
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*prev = (*prev)->next;
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