UVA - 11965 - Extra Spaces

import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStreamReader;
import java.math.BigInteger;

public class Main {

    public static void main(String[] args) throws IOException {
        InputStreamReader isr = new InputStreamReader(System.in);
        BufferedReader br = new BufferedReader(isr);
        StringBuffer sb = new StringBuffer("");
        int num = Integer.parseInt(br.readLine());
        String m="";
        for (int i = 1; i < num+1; i++) {
            int n=Integer.parseInt(br.readLine());
            if(i>1)
                sb.append("\n");
            sb.append("Case ").append(i).append(":\n");
            for (int j = 1; j < n+1; j++){
              
                StringBuilder temp=new StringBuilder();
                m=br.readLine();
                boolean flag=false;
                for(int z=0;z<m.length();z++){
                    if(m.charAt(z)==' '){
                        if(!flag){
                            temp.append(m.charAt(z));
                           flag=true;
                        }
                    }else{
                        flag=false;
                        temp.append(m.charAt(z));
                    }
                }
                sb.append(temp).append("\n");
            }
        }
        System.out.print(sb);
    }
 
}