Does the decimal end or repeat?

A fraction in lowest terms has a decimal that ends exactly when its bottom has no prime factor other than $2$ and $5$. You will strip those factors away and test a list of fractions, without dividing.

The idea. Divide the bottom by $2$ while you can, then by $5$ while you can. If $1$ is left, the decimal ends. Reduce the fraction first, with gcd.

Your tasks.

1. In strip, return what is left of q after taking out every $2$ and every $5$.
2. In ends, reduce p / q and return True when its decimal ends.
3. Fill enders with the fractions in fractions whose decimals end.