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43d0623086
Although marked as 'TODO', three tests pass without any implementation because the correct answer code already exists.
Error handling
Most errors aren’t serious enough to require the program to stop entirely. Sometimes, when a function fails, it’s for a reason that you can easily interpret and respond to. For example, if you try to open a file and that operation fails because the file doesn’t exist, you might want to create the file instead of terminating the process.