Fix Reentrancy Vulnerability in executeTransaction
#81
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…ks-Effects-Interactions pattern and reentrancy guards.
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This pull request addresses a high-risk reentrancy vulnerability in the executeTransaction function. The changes implement the Checks-Effects-Interactions (CEI) pattern to prevent reentrant calls. The function also now uses send for simple Ether transfers and properly checks for transaction success before setting the executed state.