><>, 32 bytes

::{::}@(?\=?v{:}-
.!09}}${{/;n/>

Accepts two values from the stack and apply the euclidian algorithm to produce their GCD.

You can try it here!

For a much better answer in ><>, check out Sok's !

><>, 32 bytes

::{::}@(?\=?v{:}-
.!09}}${{/;n/>

Accepts two values from the stack and apply the euclidian algorithm to produce their GCD.

You can try it here!

For a much better answer in ><>, check out Sok's !

><>, 32 bytes

::{::}@(?\=?v{:}-
.!09}}${{/;n/>

Accepts two values from the stack and apply the euclidian algorithm to produce their GCD.

You can try it here!

><>, 32 bytes

::{::}@(?\=?v{:}-
.!09}}${{/;n/>

Accepts two values from the stack and apply the euclidian algorithm to produce their GCD.

You can try it here!

For a much better answer in ><>, check out Sok's !