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## switchcase
### Instructions
Write a program that takes two strings and displays, without doubles, the characters that appear in both strings, in the order they appear in the first one.
- The display will be followed by a `\n`.
- If the number of arguments is not 2, the program displays `\n`.
### Expected output
```console
student@ubuntu:~/piscine/test$ go build
student@ubuntu:~/piscine/test$ ./test "padinton" "paqefwtdjetyiytjneytjoeyjnejeyj"
padinto
student@ubuntu:~/piscine/test$ ./test ddf6vewg64f twthgdwthdwfteewhrtag6h4ffdhsd
df6ewg4
student@ubuntu:~/piscine/test$
```