Finding duplicate elements

[vino]

On Wednesday, 16 August 2023 at 12:51:31 UTC, FeepingCreature 
wrote:
> On Tuesday, 15 August 2023 at 17:59:27 UTC, vino wrote:
>> [...]
>
> ```
> import std;
> void main() {
>     string[] args = [" test3", "test2 ", " test1 ", " test1 ", 
> " "];
>     findDuplicates(args);
> }
> void findDuplicates(string[] args) {
>     bool[string] dupes;
>     foreach (arg; args) {
>         if (arg in dupes) {
>             writefln!"Duplicate element found: %s"(arg);
>             return;
>         }
>         dupes[arg] = true;
>     }
>     writefln!"%s"(dupes.keys);
> }
> ```

Thank you very much