Removed unused variables and changed other used variables to better suited types

[NotAGameDev07]

"int" should not be used as it takes 4 bytes and values do not go above 2 ** 16 therefore changing to short, unsigned char, unsigned short, signed char, etc is better suited due to all values using at most 2 bytes.

[NotAGameDev07]

this should save a few microseconds/milliseconds, I also might try to change some compiler flags to use -O3 for gcc/g++ due to speed improvements, also I recommend MinGW as gcc/g++ on windows is 3 times faster than MSVC/MSVC++ at runtime and/or compilation-time, sources are applications (that have windows and linux versions) running on same hardware on windows vs linux.

[aarrbba123]

don't forget biodata struct, since it also uses integers too.
although i'm a bit scared with overflows, since some of us (like me) like to put values way past the 16-bit integer limit.