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#N1556. Thousand Separator
problem link=>https://leetcode.com/problems/thousand-separator/

#solution
class Solution {
public String thousandSeparator(int n) {
String str=String.valueOf(n);
int xonalar=str.length();
String ans="";

if(xonalar<=3) return str;

if(xonalar>3&&xonalar%3!=0)
ans+=str.substring(0, xonalar%3)+".";

int index=xonalar%3+2;
while(index<=xonalar){
ans+=str.substring(index-2, index+1)+".";
index+=3;
}

return ans.substring(0, ans.length()-1);
}
}