fix bug

matrix.c

@@ -67,14 +67,18 @@ Matrix add(const Matrix matrix1, const Matrix matrix2)
         return createMatrix(0, 0);
     }
 
-    if (matrix1.cols != matrix2.cols)
-    {
+    // matrices not compatible
     if (matrix1.rows != matrix2.rows)
     {
         clearMatrix(&resMat);
         return resMat;
     }
-        else if (matrix1.cols == 1)
+
+    // check if broadcasting is possible
+    if (matrix1.cols != matrix2.cols)
+    {
+        // matrix1 is a vector
+        if (matrix1.cols == 1)
         {
             // broadcast vector
             for (size_t m = 0; m < matrix2.rows; m++)
@@ -86,6 +90,7 @@ Matrix add(const Matrix matrix1, const Matrix matrix2)
             }
             return resMat;
         }
+        // matrix2 is a vector
         else if (matrix2.cols == 1)
         {
             // broadcast vector
@@ -98,6 +103,7 @@ Matrix add(const Matrix matrix1, const Matrix matrix2)
             }
             return resMat;
         }
+        // addition not possible
         else
         {
             clearMatrix(&resMat);