Ловим утечки памяти в С/С++

struct Student create_student();
void ControlMenu();

int main()
{
    ControlMenu();
    return 0;
}

void ShowListMenu(int kX)
{
    char listMenu[COUNT_LIST_MENU][55] = { {"Read students from file"}, {"Input student and push"},
    {"Input student and push it back"}, {"Input student and push it after student"},
    {"Delete last student"}, {"Write students to file"}, {"Find student"}, {"Sort students"},
    {"Show list of students"}, {"Exit"} };
    for (int i = 0; i < COUNT_LIST_MENU; i++)
    {
        if (i == kX)
        {
            printf("%s", listMenu[i]);
            printf(" <=\n");
        }
        else
            printf("%s\n", listMenu[i]);
    }
}

void ControlMenu()
{
    struct ListOfStudents* list = NULL;
    int kX = 0, key;
    int exit = FALSE;
    ShowListMenu(kX);
    do
    {
        key = _getch();
        switch (key)
        {
        case 72: //up
        {
            if (kX == 0)
                kX = COUNT_LIST_MENU-1;
            else
                kX--;
        }break;
        case 80: //down
        {
            if (kX == COUNT_LIST_MENU-1)
                kX = 0;
            else
                kX++;
        }break;
        case 13:
        {
            if (kX == 0)
            {
                int sizeStudents = 0;
                struct Student* students = (struct Student*)malloc(1 * sizeof(struct Student));
                char* path = (char*)malloc(255 * sizeof(char));
                printf("Put the path to file with students: ");
                scanf("%s", path);
                int size = 0;
                students = read_students(path, &size);
                if (students == NULL)
                {
                    printf("Can't open this file.\n");
                }
                else
                {
                    for (int i = 0; i < size; i++)
                    {
                        if (i == 0)
                        {
                            list = init(students[i]);
                        }
                        else
                        {
                            list = add_new_elem_to_start(list, students[i]);
                        }
                    }
                }
                                free(students);
                printf("\nPress any key to continue...");
                getchar();
                getchar();
                free(path);
            }
            else if (kX == 1 || kX == 2 || kX == 3 || kX == 6)
            {
                struct Student student = create_student();
                if (kX == 1)
                {
                    if (list == NULL)
                    {
                        list = init(student);
                    }
                    else
                    {
                        list = add_new_elem_to_start(list, student);
                    }
                    printf("\nPress any key to continue...");
                    getchar();
                    getchar();
                }
                else if (kX == 2)
                {
                    if (list == NULL)
                    {
                        list = init(student);
                    }
                    else
                    {
                        list = add_new_elem_to_end(list, student);
                    }
                    printf("\nPress any key to continue...");
                    getchar();
                    getchar();
                }
                else if (kX == 3)
                {
                    if (list == NULL)
                    {
                        list = init(student);
                        printf("The list was empty, so, list have been created.\n");
                    }
                    else
                    {
                        int position;
                        printf("Put the position: ");
                        scanf("%d", &position);
                        list = add_new_elem_after_pos(list, student, position);
                    }
                    printf("\nPress any key to continue...");
                    getchar();
                    getchar();
                }
                else
                {
                    if (find_elem(list, student))
                        printf("Student exist");
                    else
                        printf("Student doesn't exist");
                    printf("\nPress any key to continue...");
                    getchar();
                    getchar();
                }
            }
            else if (kX == 4)
            {
                if (list == NULL)
                {
                    printf("List is empty.\n");
                }
                else
                {
                    list = delete_elem(list);
                }
                printf("\nPress any key to continue...");
                getchar();
                getchar();
            }
            else if (kX == 5)
            {
                char* path = (char*)malloc(255 * sizeof(char));
                printf("Put the path to file with students: ");
                scanf("%s", path);
                if (write_students(list, path) == 0)
                {
                    printf("Can't write");
                    printf("\nPress any key to continue...");
                    getchar();
                    getchar();
                }
                free(path);
            }
            else if (kX == 7)
            {
                if (list == NULL)
                {
                    printf("List is empty.\n");
                }
                else
                {
                    list = sort_list(list);
                }
                printf("\nThe list was successfully sorted");
                printf("\nPress any key to continue...");
                getchar();
                getchar();
            }
            else if (kX == 8)
            {
                system("cls");
                show_list(list);
                printf("\nPress any key to continue...");
                getchar();
                getchar();
            }
            else
                exit = TRUE;
        }break;
        case 27:
        {
            exit = TRUE;
        }break;
        }
        system("cls");
        ShowListMenu(kX);
    } while (exit == FALSE);
    while (list != NULL)
    {
        list = delete_elem(list);
    }
}

struct Student create_student()
{
    struct Student new_student;
    do
    {
        printf("Write the name of student\n");
        scanf("%s", new_student.first_name);
    } while (strlen(new_student.first_name) == 0);
    do
    {
        printf("Write the last name of student\n");
        scanf("%s", new_student.last_name);
    } while (strlen(new_student.last_name) == 0);
    do
    {
        printf("Write the patronyminc of student\n");
        scanf("%s", new_student.patronyminc);
    } while (strlen(new_student.patronyminc) == 0);
    do
    {
        printf("Write the city of student\n");
        scanf("%s", new_student.city);
    } while (strlen(new_student.city) == 0);
    do
    {
        printf("Write the district of student\n");
        scanf("%s", new_student.disctrict);
    } while (strlen(new_student.disctrict) == 0);
    do
    {
        printf("Write the country of student\n");
        scanf("%s", new_student.country);
    } while (strlen(new_student.country) == 0);
    do
    {
        printf("Write the phone number of student\n");
        scanf("%s", new_student.phoneNumber);
    } while (strlen(new_student.phoneNumber) != 13);
    char* choose = (char*)malloc(255 * sizeof(char));
    while (TRUE)
    {
        printf("Does student live in hostel? Y - yes, N - no\n");
        scanf("%s", choose);
        if (strcmp(choose, "y") == 0 || strcmp(choose, "Y") == 0)
        {
            new_student.is_live_in_hostel = TRUE;
            break;
        }
        if (strcmp(choose, "n") == 0 || strcmp(choose, "n") == 0)
        {
            new_student.is_live_in_hostel = FALSE;
            break;
        }
    }
    while (TRUE)
    {
        printf("Does student get scholarship? Y - yes, N - no\n");
        scanf("%s", choose);
        if (strcmp(choose, "y") == 0 || strcmp(choose, "Y") == 0)
        {
            new_student.is_live_in_hostel = TRUE;
            break;
        }
        if (strcmp(choose, "n") == 0 || strcmp(choose, "n") == 0)
        {
            new_student.is_live_in_hostel = FALSE;
            break;
        }
    }
    free(choose);
    for (int i = 0; i < 3; i++)
    {
        char temp[10];
        printf("Write the %d mark of ZNO\n", i + 1);
        scanf("%s", temp);
        new_student.mark_zno[i] = atof(temp);
        if (new_student.mark_zno[i] == 0)
        {
            i--;
        }
    }

    return new_student;
}

#include <stdlib.h>
#include <stdio.h>
#define N 10

int main()
{
    int * mas = (int *)malloc(N * sizeof(int));
    for(int i = 0; i < N; i++)
    {
        *(mas+i) = i;
        printf("%d\t", *(mas+i));
    }
    printf("\n");
    return 0;
}