cmake -S . -G build -G Ninja
cd build
ninja
echo '!@#$%^&*()_~<>' > base64.dat
cat base64.dat | ./base64encode - > base64.txt
cat base64.dat | ./base64encode - | ./base64decode - | diff base64.dat -
./base64encode base64.dat base64.txt
./base64decode base64.txt base64.dat
hexdump -C base64.dat
00000000 21 40 23 24 25 5e 26 2a 28 29 5f 7e 3c 3e 0a |!@#$%^&*()_~<>.|
0000000f
cat base64.txt
IUAjJCVeJiooKV9+PD4K