Fibonacci expert advisor question

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Hey there,

I'm currently working on an expert advisor that uses fibonacci levels. This way I can backtest those levels. I'm using an indicator by deVries (included below) to try and get the last high and low of the ZigZag indicator. 

This is what I'm trying... However, it doesn't work.

Could anybody help me out? I have limited programming knowledge, but I'm trying to improve. 

   double swinghigh;
   double swinglow;
   
   double lvl00;
   double lvl23;
   double lvl38;
   double lvl50;
   double lvl61;
   double lvl100;
   
   swinghigh = iCustom(Symbol(),0, "Zigzag_with_line_at_lows_and_line_at_highs",ExtDepth,ExtDeviation,ExtBackstep,3,0);
   swinglow = iCustom(Symbol(),0,"Zigzag_with_line_at_lows_and_line_at_highs",ExtDepth,ExtDeviation,ExtBackstep,4,0);

   lvl00=swinghigh;
   lvl23=swinghigh-(swinghigh-swinglow)*0.236;
   lvl38=swinghigh-(swinghigh-swinglow)*0.382;
   lvl50=swinghigh-(swinghigh-swinglow)*0.500;
   lvl61=swinghigh-(swinghigh-swinglow)*0.618;
   lvl100=swinglow;
 
Perhaps if you detail a bit what you actually mean by "it doesn't work" ?
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