fix some file extensions

Task/Happy-numbers/DWScript/happy-numbers.dw

@@ -0,0 +1,30 @@
+function IsHappy(n : Integer) : Boolean;
+var
+   cache : array of Integer;
+   sum : Integer;
+begin
+   while True do begin
+      sum := 0;
+      while n>0 do begin
+         sum += Sqr(n mod 10);
+         n := n div 10;
+      end;
+      if sum = 1 then
+         Exit(True);
+      if sum in cache then
+         Exit(False);
+      n := sum;
+      cache.Add(sum);
+   end;
+end;
+
+var n := 8;
+var i : Integer;
+
+while n>0 do begin
+   Inc(i);
+   if IsHappy(i) then begin
+      PrintLn(i);
+      Dec(n);
+   end;
+end;