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## union
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### Instructions
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Write a program that takes two `string` and displays, without doubles, the characters that appear in either one of the `string`.
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The display will be in the order characters appear in the command line, and will be followed by a newline (`'\n'`).
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If the number of arguments is different from 2, then the program displays newline (`'\n'`).
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### Usage
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```console
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student@ubuntu:~/[[ROOT]]/union$ go build
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student@ubuntu:~/[[ROOT]]/union$ ./union zpadinton "paqefwtdjetyiytjneytjoeyjnejeyj" | cat -e
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zpadintoqefwjy$
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student@ubuntu:~/[[ROOT]]/union$ ./union ddf6vewg64f gtwthgdwthdwfteewhrtag6h4ffdhsd | cat -e
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df6vewg4thras$
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student@ubuntu:~/[[ROOT]]/union$ ./union "rien" "cette phrase ne cache rien" | cat -e
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rienct phas$
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student@ubuntu:~/[[ROOT]]/union$ ./union | cat -e
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$
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student@ubuntu:~/[[ROOT]]/union$ ./union "rien" | cat -e
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$
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student@ubuntu:~/[[ROOT]]/union$
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```
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