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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. If there are no 'a' characters in the
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string, the program just writes a newline. If the number of parameters is not
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1, the program displays 'a' followed by a newline.
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### Expected main and function for the program
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### Expected output
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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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student@ubuntu:~/piscine/test$
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```
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