Hello everyone, I need help implementing this function please.

void load (std::string filename, SingleLinkedListNode*& list) { // Open the file in read only mode. //Read the values from the file and push them at the end of the list one after another. void save (const SingleLinkedlistNode* list, std::string filename) { // Open the file in write only mode. //Go through the list and write the vlaues from the list into the file on // the same line separated by spaces