How to create my own library and solve everything?

I got another post about dealing with big numbers. So why not just create my own "huge num"? Can anyone teach me?
huge num have 256bits or better just as many bits as required for the number.

so if I import my library I can do something below.

unsigned huge num a = 19287398126712864982134721;

"unisnged huge nume" in blue.

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