[ notes ]

str = "test"
a = 11
b = 22
c = 33

format specifier "%s-%d%d%d"

sprintf(targetstr, "%s-%d%d%d", str,a,b,c)

test-112233

actual serial key format:

name-yearmonthday
test-2021319

References:
````````````
[bitwise operations]
https://www.tutorialspoint.com/cprogramming/c_bitwise_operators.htm

[sprintf function]
https://www.tutorialspoint.com/c_standard_library/c_function_sprintf.htm

[GetLocalTime]
https://docs.microsoft.com/en-us/windows/win32/api/sysinfoapi/nf-sysinfoapi-getlocaltime

[SYSTEMTIME structure]
https://docs.microsoft.com/en-us/windows/win32/api/minwinbase/ns-minwinbase-systemtime