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## displaya
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### Instructions
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Write a program that takes a `string`, and displays the first `a` character it
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encounters in it, followed by a newline(`'\n'`). If there are no `a` characters in the
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string, the program just writes `a` followed by a newline(`'\n'`). If the number of parameters is not
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1, the program displays an `a` followed by a newline(`'\n'`).
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### Usage
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```console
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student@ubuntu:~/piscine/test$ go build
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student@ubuntu:~/piscine/test$ ./test "abc"
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a
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student@ubuntu:~/piscine/test$ ./test "bcvbvA"
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a
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student@ubuntu:~/piscine/test$ ./test "nbv"
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a
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student@ubuntu:~/piscine/test$
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```
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