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At a garage sale, you find a lovely vintage typewriter at a bargain price! Excitedly, you rush home, insert a sheet of paper, and start typing away. However, your excitement wanes when you examine the output: all words are garbled! For example, it prints "stop" instead of "post" and "least" instead of "stale." Carefully, you try again, but now it prints "spot" and "slate." After some experimentation, you find there is a random delay before each letter is printed, which messes up the order. You now understand why they sold it for so little money!
You realize this quirk allows you to generate anagrams, which are words formed by rearranging the letters of another word. Pleased with your finding, you spend the rest of the day generating hundreds of anagrams.
Your task is to, given a target word and a set of candidate words, to find the subset of the candidates that are anagrams of the target.
An anagram is a rearrangement of letters to form a new word: for example "owns" is an anagram of "snow".
A word is not its own anagram: for example, "stop" is not an anagram of "stop".
The target and candidates are words of one or more ASCII alphabetic characters (A-Z and a-z).
Lowercase and uppercase characters are equivalent: for example, "PoTS" is an anagram of "sTOp", but StoP is not an anagram of sTOp.
The anagram set is the subset of the candidate set that are anagrams of the target (in any order).
Words in the anagram set should have the same letter case as in the candidate set.
Given the target "stone" and candidates "stone", "tones", "banana", "tons", "notes", "Seton", the anagram set is "tones", "notes", "Seton".
The Rust track extends the possible letters to be any unicode character, not just ASCII alphabetic ones.
You are going to have to adjust the function signature provided in the stub in order for the lifetimes to work out properly. This is intentional: what's there demonstrates the basics of lifetime syntax, and what's missing teaches how to interpret lifetime-related compiler errors.
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