Replace strcpy() with strncpy() to avoid buffer overflows

Replace strcpy() with strncpy() to avoid buffer overflows

Using strcpy() is not safe since destination buffer may overflow, for
example if the string being copied doesn't contain a terminator.
This patch replaces strcpy() with strncpy() to make sure no buffer
overflows happen.

Signed-off-by: Sebastien GODARD <sysstat@users.noreply.github.com>