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