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user@intervues:~/$
Implement a basic calculator to evaluate a valid arithmetic expression string that may contain non-negative integers, the operators +, -, *, and /, and parentheses ( ). The expression is guaranteed to be valid, uses standard operator precedence (parentheses first, then * and / left-to-right, then + and - left-to-right), and may include spaces between tokens. Division truncates toward zero. Your task is to parse and compute the value of the expression without using any built-in eval or similar functions.