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class Solution {

public String reverseWords(String s) {

String x = s.trim();

char arr[] = s.toCharArray();

StringBuilder sb = new StringBuilder();

List<String> list = new ArrayList<>();

for(int i=0;i<arr.length;i++)

{

if(arr[i]!=' ')

{

sb.append(arr[i]);

}

if(i!=arr.length-1)

{

if(arr[i]==' '&&arr[i+1]!=' ')

{

String t = sb.toString();

list.add(t);

sb = new StringBuilder();

}

}

else

{

String t = sb.toString();

list.add(t);

}

}

int k =list.size()-1;

sb = new StringBuilder();

while(k>=0)

{

sb.append(' ');

sb.append(list.get(k));

k--;

}

return sb.toString().trim();

}

}