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class remove_space
{
    public static void main(String ar[])
    {
        String a="This       is            sparta!";
        while(a.contains(" "))
        {
            a=a.replaceAll(" ","");
        }
        System.out.println(a);
    }
}


Code :- Filename:- RemoveGap.java
class RemoveGap
{
 public static void main(String ar[]){
  RemoveGap rg=new RemoveGap();
  System.out.println(rg.remove("Hello     guys    this is   Unpossible   POG"));
 }
 public String remove(String s)
 {
  while(s.contains("  "))
  {
   s=s.replaceAll("  "," ");
  }
  return s;
 }
}