diff --git a/matrix.c b/matrix.c
index 85f5b80..e5095b2 100644
--- a/matrix.c
+++ b/matrix.c
@@ -7,7 +7,7 @@
 Matrix createMatrix(unsigned int rows, unsigned int cols)
 {
 
-    Matrix m = {NULL, rows, cols} //Wahrscheinlich in Programm bereits enthalten;
+    Matrix m = {NULL, rows, cols}; // Wahrscheinlich in Programm bereits enthalten;
 
     if (rows > 0 && cols > 0)
     {
@@ -22,7 +22,6 @@ Matrix createMatrix(unsigned int rows, unsigned int cols)
     return m;
 }
 
-
 void clearMatrix(Matrix *matrix)
 {
 
@@ -36,14 +35,12 @@ void clearMatrix(Matrix *matrix)
 }
 
 void setMatrixAt(MatrixType value, Matrix matrix, unsigned int rowIdx, unsigned int colIdx)
-    //not testet
+// Matrix matrix zu Matrix *matrix, empfehlung
 {
     if (rowIdx < matrix.rows && colIdx < matrix.cols && matrix.buffer != NULL)
         matrix.buffer[rowIdx * matrix.cols + colIdx] = value;
 }
 
-    
-
 MatrixType getMatrixAt(const Matrix matrix, unsigned int rowIdx, unsigned int colIdx)
 {
     if (rowIdx >= matrix.rows || colIdx >= matrix.cols || matrix.buffer == NULL)
@@ -51,56 +48,55 @@ MatrixType getMatrixAt(const Matrix matrix, unsigned int rowIdx, unsigned int co
     return matrix.buffer[rowIdx * matrix.cols + colIdx];
 }
 
-//TODO: Funktionen implementieren
+// TODO: Funktionen implementieren
 
 Matrix add(const Matrix matrix1, const Matrix matrix2)
 {
-    //Needed: rows/Zeilen, collums/Spalten
+    // Needed: rows/Zeilen, collums/Spalten
 
-    //test, if two matrix has exact size
+    // test, if two matrix has exact size
+
+    if (matrix1.rows != matrix2.rows || matrix1.cols != matrix2.cols)
+        return createMatrix(0, 0);
 
-    if(matrix1.rows != matrix2.rows || matrix1.cols != matrix2.cols)
-        return createMatrix(0,0);
-    
     Matrix result_add = createMatrix(matrix1.rows, matrix1.cols);
 
-    for(int r = 0; r < matrix1.rows; r++)
+    for (int r = 0; r < matrix1.rows; r++)
     {
-        for(int c = 0; c < matrix1.cols; c++)
+        for (int c = 0; c < matrix1.cols; c++)
         {
-            //TODO: matrix_add initialisieren
-            //matrix_add[r][c] = matrix1[r][c] + matrix2[r][c]
+            // TODO: matrix_add initialisieren
+            // matrix_add[r][c] = matrix1[r][c] + matrix2[r][c]
 
-            MatrixType sum = getMatrixAt(matrix1,r,c)+getMatrixAt(matrix2,r,c);
-            setMatrixAt(sum,result_add,r,c) //evtl re
+            MatrixType sum = getMatrixAt(matrix1, r, c) + getMatrixAt(matrix2, r, c);
+            setMatrixAt(sum, result_add, r, c); // evtl re
         }
     }
 }
 
 Matrix multiply(const Matrix matrix1, const Matrix matrix2)
 {
-    //Needed: rows/Zeilen, collums/Spalten
-    MatrixType buffer_add = 0; //TODO: Datentyp achten, ist int richitg?
-    Matrix result = {NULL, 0, 0}; //Leere Matrix, falls fehler
-    //Probe ob Spalten1 = Zeilen2
-    if(matrix1.cols != matrix2.rows)
-        return -1;
+    // Needed: rows/Zeilen, collums/Spalten
+    MatrixType buffer_add;
+    // Probe ob Spalten1 = Zeilen2
+    if (matrix1.cols != matrix2.rows)
+        return createMatrix(0, 0);
 
-    result = createMatrix(matrix1.rows, matrix2.cols); // ""
+    Matrix result = createMatrix(matrix1.rows, matrix2.cols); // ""
 
-    for(int index = 0; index < matrix1.rows; index++)
+    for (int index = 0; index < matrix1.rows; index++)
     {
-        for(int shift = 0; shift < matrix2.cols; shift++)
+        for (int shift = 0; shift < matrix2.cols; shift++)
         {
-            for(int skalar = 0; skalar<matrix1.cols; skalar++)
-            //TODO: matrix_add initialisieren
+            buffer_add = 0;
+            for (int skalar = 0; skalar < matrix1.cols; skalar++)
+            // TODO: matrix_add initialisieren
             {
-                //buffer_add += matrix1[index][skalar]*matrix2[skalar][index];
+                // buffer_add += matrix1[index][skalar]*matrix2[skalar][index];
                 buffer_add += getMatrixAt(matrix1, index, skalar) * getMatrixAt(matrix2, skalar, shift);
             }
-            //matrix_mul[index][shift] = buffer_add;
-            setMatrixAt(buffer_add,result,index,shift); //result als Pointer, also mit &result
+            // matrix_mul[index][shift] = buffer_add;
+            setMatrixAt(buffer_add, result, index, shift); // result als Pointer, also mit &result
         }
-    buffer_add = 0;
     }
 }
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