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## alphamirror
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### Instructions
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Write a program called alphamirror that takes a string as argument and displays this string
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after replacing each alphabetical character with the opposite alphabetical
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character.
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The case of the letter stays the same, for example :
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'a' becomes 'z', 'Z' becomes 'A'
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'd' becomes 'w', 'M' becomes 'N'
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The final result will be followed by a newline.
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If the number of arguments is not 1, the program will display only a newline.
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Example of output :
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```console
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student@ubuntu:~/student/alphamirror$ go build
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student@ubuntu:~/student/alphamirror$ ./alphamirror "abc"
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zyx
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student@ubuntu:~/student/alphamirror$ ./alphamirror "My horse is Amazing." | cat -e
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Nb slihv rh Znzarmt.$
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student@ubuntu:~/student/alphamirror$ ./alphamirror | cat -e
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$
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student@ubuntu:~/student/alphamirror$
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```
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