Doing an assignment for school and currently meet some problem

void modifyMember() {

FILE* selectedMember = fopen("selectedMember.txt", "r");

if (selectedMember == NULL) {

    printf("Error: Unable to open selected member filen");

    exit(-1);

}



char memID[10], memPass[10];

fscanf(selectedMember, " %[^|]|%[^|]|", memID, memPass);



fclose(selectedMember);



FILE* memberPtr = fopen("memberlist.txt", "r+");

FILE* tempPtr1 = fopen("tempfileNember.txt", "w");



if (memberPtr == NULL || tempPtr1 == NULL) {

    printf("Error: Unable to open member list filesn");

    return;

}



struct memberModule memMDL;

int found = 0;



rewind(memberPtr); // Rewind file pointer to beginning of file



while (fscanf(memberPtr, "%[^|]|%[^|]|%[^|]|%[^|]|%[^|]|%[^|]|%sn", memMDL.memberId, memMDL.name, memMDL.password, memMDL.passwordRecovery, memMDL.gender, memMDL.ic, memMDL.contactNumber) == 7) {

    if (strcmp(memMDL.memberId, memID) == 0) {

        found = 1;

        // Show existing member details

        printf("| Existing Member Details:          |n");

        printf("|-----------------------------------|n");

        printf("| ID: %-30s|n", memMDL.memberId);

        printf("| Name: %-28s|n", memMDL.name);

        printf("| Gender: %-26s|n", memMDL.gender);

        printf("| IC: %-30s|n", memMDL.ic);

        printf("| Contact Number: %-18s|n", memMDL.contactNumber);

        printf("|-----------------------------------|n");



        // Modify member details

        printf("| Enter new Name:                   |>> ");

        rewind(stdin);

        scanf(" %[^n]", memMDL.name);

        while (!validateName(memMDL.name)) {

            printf("Invalid format! Please enter a valid name (letters only): ");

            scanf(" %[^n]", memMDL.name);

        }



        printf("| Enter new Gender(M/F):            |>> ");

        rewind(stdin);

        scanf(" %s", memMDL.gender);

        while (!validateGender(memMDL.gender)) {

            printf("Invalid format! Please enter 'M' or 'F' for gender: ");



            scanf(" %s", memMDL.gender);

        }



        printf("| Enter new IC:                     |>> ");

        rewind(stdin);

        scanf(" %[^n]", memMDL.ic);

        while (!validateIC(memMDL.ic)) {

            printf("Invalid format! Please enter a valid IC (12-digit number): ");

            scanf(" %[^n]", memMDL.ic);

        }



        printf("| Enter new Contact Number:         |>> ");

        rewind(stdin);

        scanf(" %[^n]", memMDL.contactNumber);

        while (!validateContactNumber(memMDL.contactNumber)) {

            printf("Invalid format! Please enter a valid contact number (10-digit number): ");

            scanf(" %[^n]", memMDL.contactNumber);

        }



        // Write modified member details

        fprintf(tempPtr1, "%s|%s|%s|%s|%s|%s|%sn", memMDL.memberId, memMDL.name, memMDL.password, memMDL.passwordRecovery, memMDL.gender, memMDL.ic, memMDL.contactNumber);

        printf("|-----------------------------------|n");

        printf("| Member Modified Details:          |n");

        printf("|-----------------------------------|n");

        printf("| ID: %-30s|n", memMDL.memberId);

        printf("| Name: %-28s|n", memMDL.name);

        printf("| Gender: %-26s|n", memMDL.gender);

        printf("| IC: %-30s|n", memMDL.ic);

        printf("| Contact Number: %-18s|n", memMDL.contactNumber);

        printf("|-----------------------------------|n");

    }

   

}



fclose(memberPtr);

fclose(tempPtr1);



remove("memberlist.txt");

rename("tempfileNember.txt", "memberlist.txt");



if (!found) {

    printf("| Member not found |n");

}

else {

    printf("| Member modified successfully! |n");

}

return;

}

Here are my code, so after i modified the member info, the memberlist.txt still remain as the old one. When i want to use other function like search member and display member, the result is still the old one that havent updated yet. Nember is spell correctly btw.