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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 same order that the characters appear on 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 a newline (`'\n'`).
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### Usage
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```console
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$ go run . zpadinton paqefwtdjetyiytjneytjoeyjnejeyj | cat -e
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zpadintoqefwjy$
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$ go run . ddf6vewg64f gtwthgdwthdwfteewhrtag6h4ffdhsd | cat -e
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df6vewg4thras$
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$ go run . rien "cette phrase ne cache rien" | cat -e
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rienct phas$
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$ go run . | cat -e
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$
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$ go run . rien | cat -e
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$
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$
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```
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