Where should I supplement in this code??

Question

I'll update this code. But I don't know what part should I fix. Please let me know what is lacking. Or make its upgraded code!
https://code.sololearn.com/c7ZEocFamN0D/?ref=app

Answer 1

//Change char In to char in, you have started variable name from uppercase

Answer 2

Oh, I did not think that.