Quick Code for you..
public static void decompress(String originalString)
{
StringBuffer finalString = new StringBuffer();;
char prevIoUschar = originalString.charAt(0);
for(int i=1; i < originalString.length(); i+=2){
for(int j = 0 ; j< Integer.parseInt(""+originalString.charAt(i));j++) {
finalString.append(prevIoUschar);
}
if(i+1 < originalString.length())
{
prevIoUschar=originalString.charAt(i+1);
}
}
System.out.println(finalString.toString());
}
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