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## brackets
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### Instructions
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Write a program that takes an undefined number of strings in arguments. For each
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argument, the program prints on the standard output "OK" followed by a newline
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if the expression is correctly bracketed, otherwise it prints "Error" followed by
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a newline.
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Symbols considered as 'brackets' are brackets '(' and ')', square brackets '['
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and ']'and braces '{' and '}'. Every other symbols are simply ignored.
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An opening bracket must always be closed by the good closing bracket in the
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correct order. A string which not contains any bracket is considered as a
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correctly bracketed string.
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If there is no arguments, the program must print only a newline.
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And its output :
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```console
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student@ubuntu:~/student/brackets$ go build
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student@ubuntu:~/student/brackets$ ./brackets '(johndoe)' | cat -e
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OK$
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student@ubuntu:~/student/brackets$ ./brackets '([)]' | cat -e
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Error$
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student@ubuntu:~/student/brackets$ ./brackets '' '{[(0 + 0)(1 + 1)](3*(-1)){()}}' | cat -e
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OK$
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OK$
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student@ubuntu:~/student/brackets$ ./brackets | cat -e
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$
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student@ubuntu:~/student/brackets$
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```
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