Please don't post solutions in Discourse, use Solutions to discuss a solution and even there, mark your post as having spoiler content when it has a spoiler.

Please read this: https://docs.codewars.com/training/troubleshooting/

Your function isn't returning anything. There are several other problems too.

It will count how many times that character is repeated in that text. if you put set in a loop how its going to count the repeated character.
for example aditiyan
a=2
d=1
i=2
t=1
i=2
y=1
a=2
n=1