https://doc.rust-lang.org/std/char/struct.ToLowercase.html
ToLowercase in std::char - Rust
Returns an iterator that yields the lowercase equivalent of a `char`.
tolowercasestdcharrust
https://gomakethings.com/guides/strings/string-tolowercase/
String.prototype.toLowerCase() | Go Make Things
Transform all text in a string to lowercase. let text = 'This sentence has some MIXED CASE LeTTeRs in it.'; // returns
go make thingsstringprototypetolowercase
https://www.w3schools.com:443/java/ref_string_tolowercase.asp
Java String toLowerCase() Method
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java stringtolowercasemethod