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You are welcome.
Glad you got it work.

I think the problem is in your the parameters you pass when you call the repeat(int i, char c) method. To be more specific:

int x = str.charAt(0);

In the abode code x has the value of the char...

Can you post the repeat(x, y) method?

if(str == "")

You shouldn't use the == operator to compare Strings. You should use the String's equals() method.

if(str.equals(""))