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## repeatalpha
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### Instructions
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Write a program called `repeat_alpha` that takes a `string` and displays it
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repeating each alphabetical character as many times as its alphabetical index.
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The result must be followed by a newline (`'\n'`).
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`'a'` becomes `'a'`, `'b'` becomes `'bb'`, `'e'` becomes `'eeeee'`, etc...
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The case remains unchanged.
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If the number of arguments is different from 1, the program displays a newline (`'\n'`).
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### Usage
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```console
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student@ubuntu:~/piscine-go/repeatalpha$ go build
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student@ubuntu:~/piscine-go/repeatalpha$ ./repeatalpha "abc" | cat -e
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abbccc
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student@ubuntu:~/piscine-go/repeatalpha$ ./repeatalpha "Alex." | cat -e
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Alllllllllllleeeeexxxxxxxxxxxxxxxxxxxxxxxx.$
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student@ubuntu:~/piscine-go/repeatalpha$ ./repeatalpha "abacadaba 42!" | cat -e
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abbacccaddddabba 42!$
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student@ubuntu:~/piscine-go/repeatalpha$ ./repeatalpha | cat -e
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$
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student@ubuntu:~/piscine-go/repeatalpha$ ./repeatalpha "" | cat -e
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$
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student@ubuntu:~/piscine-go/repeatalpha$
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```
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