C library function - sprintf() - Online Tutorials Library
https://www.tutorialspoint.com/c_standard_library/c_function_sprintf.htm
If successful, the total number of characters written is returned excluding the null-character appended at the end of the string, otherwise a negative number is returned in case of failure.
If successful, the total number of characters written is returned excluding the null-character appended at the end of the string, otherwise a negative number is returned in case of failure.
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