Finished StringCheck Method but did not test yet

imageInput.c

@@ -8,6 +8,27 @@
 
 // TODO Implementieren Sie geeignete Hilfsfunktionen für das Lesen der Bildserie aus einer Datei
 
+int checkString (FILE *file){ //Checks if String at the start of File equals expected Format (0 for wrong 1 for right)
+	if (file == NULL){ //returns 0 for empty file
+		return 0;
+		}
+	char expectedString[] = FILE_HEADER_STRING;
+	char actualString[BUFFER_SIZE];
+
+	rewind(file);
+	size_t bytesRead = fread(actualString, 1,27 , file); //Stores Bytes of start of File to actualString
+	if (bytesRead != 27){
+	return 0;} //Returns 0 if File is to short
+	actualString[27] = '\0';
+
+	if (strcmp(actualString, expectedString) != 0){
+	return 0;
+}
+	else{
+	return 1;
+}
+}
+
 // TODO Vervollständigen Sie die Funktion readImages unter Benutzung Ihrer Hilfsfunktionen
 GrayScaleImageSeries *readImages(const char *path)
 {

matrix.c

@@ -13,12 +13,17 @@ typedef struct Matrix {
 
 Matrix createMatrix(unsigned int rows, unsigned int cols)
 {
-    
+    Matrix newMatrix;
+	newMatrix.rows = rows;
+	newMatrix.cols = cols;
+	newMatrix.buffer = calloc(rows*cols, sizeof(MatrixType))
+	return newMatrix;
 }
 
 void clearMatrix(Matrix *matrix)
 {
-    
+    free(*matrix.buffer);
+	*matrix.buffer = NULL;
 }
 
 void setMatrixAt(MatrixType value, Matrix matrix, unsigned int rowIdx, unsigned int colIdx)