fmt_ulonglong - write an ASCII representation of an unsigned long long integer

       fmt_ulonglong  writes  an  ASCII  representation  ('0' to '9', base 10) of source to dest and returns the
       number of bytes written.

       fmt_ulonglong does not append \0.

       If dest equals FMT_LEN (i.e. is zero), fmt_ulonglong returns the number of bytes it would have written.

       For convenience, fmt.h defines the  integer  FMT_ULONG  to  be  big  enough  to  contain  every  possible
       fmt_ulonglong output plus \0.

       fmt_ulonglong - write an ASCII representation of an unsigned long long integer

scan_ulonglong(3)

                                                                                                fmt_ulonglong(3)

#include<libowfat/fmt.h>

       size_t fmt_ulonglong(char *dest,unsigned long long source);