strncatBuffer method
Appends up to n characters from the string src to the end of the string dest.
Implementation
CString strncatBuffer(CString dest, CString src, int n) {
int destLen = strlenBuffer(dest);
int i = 0;
while (i < n && src[i] != 0) {
dest[destLen + i] = src[i];
i++;
}
dest[destLen + i] = 0;
return dest;
}