A noodle is totally cheap, and you should replace this immediately even if the brake appears to be working. Dragging the inner around a sharp bend will fray the strands, leading to a sudden failure and a lack of front brake when it snaps.
Noodles come in two different bend radius.
* 90 degrees, often used on the rear brake
* 135 degrees, which is most common on the front brake.
Your folding bike might use either, it looks like a 90 degree one to me.
Note, you should change the inner brake cable at the same time. Depending on condition, its also a good time to replace the outer if anything is wrong with it, like cracks or bends or rust.