Clear Brackets

Create a function brackets() that takes a string and checks that the brackets in the math expression are correct. The function should return true or false.

Examples

brackets("(a*(b-c)..... )") ➞ true

brackets(")(a-b-45/7*(a-34))") ➞ false

brackets("sin(90...)+.............cos1)") ➞ false

Notes

• The string may not contain brackets, then return true.
• String may contain spaces.
• The string may be empty.