Generates a new string from a format specifier and parameters.
Parameters
source
The string from which characters will be copied.
n
Number of characters to copy from the source string.
Returns
Pointer to the newly created string.
Remarks
MFStrN() uses a circular buffer for storing the strings it produces. You should NOT keep a long term string generated by MFStrN. MFStrN() is best suited to generating temporary and intermediate strings for immediate use.