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53. Implement SnakeCase<S>
type SnakeCase<S extends string> = S extends `${infer T}${infer U}` ? T extends Uppercase<T> ? `${T extends "" ? "" : "_"}${Lowercase<T>}${SnakeCase<U>}` : `${T}${SnakeCase<U>}` : "";// Testtype A = SnakeCase<'BigFrontEnd'> // expected to be 'big_front_end'