Hey, it's been a while scene I posted on this forum. I was able to create my first interpreter with a very basic and small language called MiniScript. If you interested, here's the repository.
set number 0
# loop
add number $number 1
remainer fizz $number 3
remainer buzz $number 5
equal fizz $fizz 0
equal buzz $buzz 0
# output
check fizz $fizz "Fizz" ""
check buzz $buzz "Buzz" ""
join output $fizz $buzz
equal outCheck $output ""
check output $outCheck $number $output
print $output
# repeat
equal repeat $number 100
not repeat $repeat
goif $repeat 3