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i also got this problem, like plant, but i cant solve it

i love my solution... took me 3 mins runtime insta ;) String src="93752xxx746x..............."; char[] srcc=src.toCharArray(); List chars = new List(); for(int i=0;i<srcc.length;i++) chars.add(Character.toString(srcc[i])); int count=0; for (int i=0;i<chars.getItemCount();i++) { if (Charact...

i always get the answer:
'' is incorrect.
what am i doing wrong?