add error exception

bin/main.cpp

@@ -33,10 +33,13 @@ std::string get_size_string(const T& size)
 
 auto main() -> int
 {
-  std::ifstream fs("/etc/mtab");
+  try 
+  {
     std::FILE* file = std::fopen("/etc/fstab", "r");
-  struct mntent* mount_entry = nullptr;
+    if (file == nullptr) 
+      throw std::runtime_error("File not found");
 
+    struct mntent* mount_entry = nullptr;
     std::cout << "\n\n";
     while ((mount_entry = getmntent(file))) 
     {
@@ -62,5 +65,10 @@ auto main() -> int
     }
 
     std::fclose(file);
-  fs.close();
+  } 
+  catch (const std::exception& e) 
+  {
+    std::cerr << e.what() << std::endl;
+    return 1;
+  }
 }