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class Solution {

public String replaceSpace(String s) {

if(s.length()==0)

{

return s;

}

StringBuilder x = new StringBuilder();

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

{

if(s.charAt(i)!=' ')

{

x.append(s.charAt(i));

}

else

{

x.append("%20");

}

}

return x.toString();

}

}