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§Password Philosophy
Parsing the rules upfront allows both part 1 and part 2 to be solved in a straightforward manner.
There’s no need to first convert the input into lines since we know that each rule has 4 parts.
Instead we use the split method with a slice of delimeters to break the input into
an Iterator of tokens, then use our utility chunk method to group the tokens into an
array of size 4.