Use strncat() instead of strncpy()

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strncat() NULL-terminates the copied string while strncpy() doesn't!

Appends at most count characters from the character array pointed to by src, stopping if the null character is found, to the end of the null-terminated byte string pointed to by dest. The character src[0] replaces the null terminator at the end of dest. The terminating null character is always appended in the end (so the maximum number of bytes the function may write is count+1).

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