How to stop kid from eating coins?

It is very common problem with kids eating coins or objects. Same thing is happen with my kid. Rudransh. 

Eating coin is very risky with my child's life. So I decided to to rid of it. That time he was  only 9 months old. 

I bring 2 coin box and placed in living hall & bed room. I gave few coins to Rudransh and teach him to put coin in coin box, each time when he puts coin I used to admire him as "Wah, Wah" with clapping 👏 👏  for him.  He feels very happy, I see a proud feeling on his face that he done something new and achieve something. 

Now I repeat this idea daily,  daily I give him 2-4 coins and tell him to put into box, then clapping 👏 for him with "Wah Wah Wah". He is enjoying this like a game. Now wherever he found coins, he put into coin box. 

I am attaching Rudransh's video for same. Must watch.