Need Help error balance checking program

[coolioschmoolio]

.... delete

[ne555]

Try your algorithm with pen and paper. Use simple test-cases, cover both good an bad result (balanced and unbalanced)
Then (hopefully) you will notice the case when it fails and may refine it.

Some examples

({})
({)
({)}
)(
(())
)

[coolioschmoolio]

... delete