Fixed tricorn_V3.c to correctly handle complex numbers and add threaded V4 skeleton

Implementierung/tricorn_V3.c

@@ -15,16 +15,15 @@ static unsigned converge(float complex position,unsigned n);
  */
 void tricorn_V3(float complex start, size_t width, ssize_t height, float res, unsigned n, _Bool color, unsigned char* img){
     
-    // Absolute height for iteration purposes
-    unsigned imag_direction = height < 0 ? -1 : 1;
-    height = height < 0 ?  height*-1 : height;
+    float imag_direction = height < 0 ? -1.0f : 1.0f;
     unsigned bytesPerColor = color ? 3 : 1;
+    height = height < 0? -height : height;
 
     // Simple iteration over every pixel in the picture
     for(size_t i = 0; i < width; i++){
         for(ssize_t j = 0; j < height; j++){
 
-            unsigned value = converge(start + (i*res - imag_direction*j*res),n);
+            unsigned value = converge(start + (i*res - I* imag_direction*j*res),n);
 
             // Pixel value position in the output array
             size_t position = (j*width +i) * bytesPerColor;