I am looking for a solution at HowTo store data in C. It is not a big deal, where people could say: "just use C++" or kind of something. It is just about storing students information. I know that C# has dictionarys or similar data storing "tools". The question is: HowTo store data in C in the most ethic way?

Here is my code, if you have a general advice, you can share it with me. I am open for everything. Btw I am a beginner at C.

#include 
#include 
#include 

bool running = true;
int userInput;

int listStudent() {
  printf("listing students...");
  return 0;
}

void addStudent() {
  printf("Hello, we are adding Students\n");
  return 0;
}

void removeStudent() {
  printf("removing Students...\n");
  return 0;
}

struct Student {
  char firstname[10];
  char surname[10];
  int age;
  int id;
};

struct Methods {
  char list[20];
  char add[20];
  char remove[20];
  char search[20];
  char exit[20];
};

void showMenuDisplay() {
    struct Methods m1;
    printf("\nMENU\n");
    printf("======\n");
    
    int i;
    for (i = 1; i <= 6; i++) {
    printf("Method [%d]: %s\n", i, m1.list);
  }

    printf("Your choice: ");
    scanf("%d", &userInput);
    switch (userInput) {
        case 1:
            printf("List Students\n");
            //listStudent();
            break;
        case 2:
            printf("Add Student\n");
            //addStudent();
            break;
        case 3:
            printf("Remove Student\n");
            //removeStudent();
            break;
        case 4: 
            printf("Search Student\n");
            //searchStudent();

            break;
        case 5:
            printf("Display by class\n");
            //displayByClass();
            break;
        case 6: 
            running = false;
            break;
        default:
            printf("\nError. Please try again.\n");
    }
}

int main(void) {
    while(running) {
        showMenuDisplay();
    }
}