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This Lua code snippet defines a function that sends a transaction and logs the result along with transaction details to a file. Here's a breakdown of what the code does:

1. local result = sendTransaction(transaction): Calls a function sendTransaction with the transaction parameter and stores the result in the result variable.

2. local sDataString = "": Initializes an empty string variable sDataString.

3. Checks if a file is provided and appends the result to sDataString if it is not empty.

4. Iterates over the key-value pairs in the transaction table and appends them to sDataString.

5. If prevString is provided, appends it to sDataString.

6. Calls a function WriteToEndOfFile(file, sDataString) to write the concatenated string to the end of the specified file.

7. Returns 1 to indicate the successful execution of the function.

Overall, this function sends a transaction, logs the result and transaction details to a file, and returns a success indicator.