Assignment name  : brackets 
Expected files   : *.c *.h
Allowed functions: write
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Write a program that takes an undefined number of strings in arguments. For each
argument, the program prints on the standard output "OK" followed by a newline 
if the expression is correctly bracketed, otherwise it prints "Error" followed by
a newline.

Symbols considered as 'brackets' are brackets '(' and ')', square brackets '[' 
and ']'and braces '{' and '}'. Every other symbols are simply ignored.

An opening bracket must always be closed by the good closing bracket in the 
correct order. A string which not contains any bracket is considered as a 
correctly bracketed string.

If there is no arguments, the program must print only a newline.

Examples :

$> ./brackets '(johndoe)' | cat -e
OK$
$> ./brackets '([)]' | cat -e
Error$
$> ./brackets '' '{[(0 + 0)(1 + 1)](3*(-1)){()}}' | cat -e
OK$
OK$
$> ./brackets | cat -e
$
$>