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## strlenprog
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### Instructions
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- Write a program that counts the characters of a `string` and that returns that value.
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- If the program receives more than one or no arguments it must not print anything.
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### Expected output :
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```console
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student@ubuntu:~/piscine-go/strlenprog$ go build
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student@ubuntu:~/piscine-go/strlenprog$ ./strlenprog "hello" | cat -e
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5$
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student@ubuntu:~/piscine-go/strlenprog$ ./strlenprog
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student@ubuntu:~/piscine-go/strlenprog$
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student@ubuntu:~/piscine-go/strlenprog$ ./strlenprog "hello" "how are you"
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student@ubuntu:~/piscine-go/strlenprog$
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```
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