new file_handling method

src/file_handling.c

@@ -0,0 +1,11 @@
+#include "file_handling.h"
+#include <stdlib.h>
+#include <stdio.h>
+
+FILE *open_file(const char *path, const char *mode, const char *error_message) {
+    FILE *file = fopen(path, mode);
+    if (!file) {
+        perror(error_message);
+    }
+    return file;
+}

src/file_handling.h

@@ -0,0 +1,5 @@
+#ifndef FILE_HANDLING_H
+#define FILE_HANDLING_H
+#include <stdio.h>
+FILE *open_file(const char *path, const char *mode, const char *error_message);
+#endif