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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 display it
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repeating each alphabetical character as many times as its alphabetical index,
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followed by a newline.
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`'a'` becomes `'a'`, `'b'` becomes `'bb'`, `'e'` becomes `'eeeee'`, etc...
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Case remains unchanged.
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If the number of arguments is not 1, just display a newline.
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Examples:
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```console
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student@ubuntu:~/student/repeatalpha$ go build
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student@ubuntu:~/student/repeatalpha$ ./repeatalpha "abc" | cat -e
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abbccc
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student@ubuntu:~/student/repeatalpha$ ./repeatalpha "Alex." | cat -e
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Alllllllllllleeeeexxxxxxxxxxxxxxxxxxxxxxxx.$
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student@ubuntu:~/student/repeatalpha$ ./repeatalpha "abacadaba 42!" | cat -e
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abbacccaddddabba 42!$
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student@ubuntu:~/student/repeatalpha$ ./repeatalpha | cat -e
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$
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student@ubuntu:~/student/repeatalpha$ ./repeatalpha "" | cat -e
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$
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student@ubuntu:~/student/repeatalpha$
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```
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