Security Vulnerabilities in Smart Contracts

Description: Smart contracts may be vulnerable to attacks like reentrancy or integer overflow, risking user funds.
Cause: Lack of proper checks and validations for inputs, and improper contract architecture.
Solution: Implement secure coding practices and use tools like OpenZeppelin for secure contract templates.

function withdraw(uint amount) external nonReentrant {
    require(balance[msg.sender] >= amount, "Insufficient balance");
    balance[msg.sender] -= amount;
    payable(msg.sender).transfer(amount);
}

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