import { suffix } from "https://deno.land/x/froebel@v0.18.0/string.ts";
Returns str suffixed with suffix. Same case and type behavior as
prefix.
type
<T0 extends string, T1 extends string, C extends StringCase | void = void>() => Suffix<T1, T0, C>
str: T1,
suffix: T0,
caseMod?: C,