Не получается разобраться с ошибкой: app.exe has triggered a breakpoint

#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <ctype.h>
#include <conio.h>
#include <string.h>
 
int list_length, prof_amount, doc_amount, assist_amount, senior_amount;
float z, y, x, w;
 
FILE *f_point;
FILE *d_point; 
FILE *a_point;
FILE *l_point;
 
struct prof {
    char university[40];
    char name[40];
    char zvannya[40];
    char posada[40];
    struct prof *next_prof;
} *first_pr, *cur_pr, *next_pr;
 
struct doc {
    char university[40];
    char name[40];
    char zvannya[40];
    char posada[40];
    char ktn[40];
    struct doc *next_docent;
} *first_doc, *cur_doc, *next_doc;
 
struct assistant {
    char university[40];
    char ktn[40];
    char name[40];
    struct assistant *next_assistant;
} *first_ass, *cur_ass, *next_ass;
 
struct lecturer {
    char university[40];
    char ktn[40];
    char name[40];
    struct lecturer *next_lecturer;
} *first_lec, *cur_lec, *next_lec;
 
 
 
 
int Open_Input_File1();
int Open_Input_File2();
int Open_Input_File3();
int Open_Input_File4();
 
int File_First_Prof();
int File_First_Doc();
int File_First_Ass();
int File_First_Lec();
 
int File_Prof();
int File_Doc();
int File_Ass();
int File_Lec();
 
int Open_Output_File1();
int Open_Output_File2();
int Open_Output_File3();
int Open_Output_File4();
 
void Write_Inf_To_File1();
void Write_Inf_To_File2();
void Write_Inf_To_File3();
void Write_Inf_To_File4();
 
 
int main() {
    char inp;
    prof_amount = 0; doc_amount = 0; assist_amount = 0; senior_amount = 0;
 
    do {
        printf("Press any button to start\n");
    
 
        Open_Input_File1 ();
        File_First_Prof ();
        while (!File_Prof ());
        File_Prof ();
        int Open_Output_File1 ();
        Write_Inf_To_File1 ();
 
 
        Open_Input_File2 ();
        File_First_Doc ();
        while (!File_Doc ());
        File_Doc();
        Open_Output_File2 ();
        Write_Inf_To_File2 ();
 
        
        Open_Input_File3 ();
        File_First_Ass ();
        while (!File_Ass ());
        File_Ass ();
        Open_Output_File3 ();
        Write_Inf_To_File3 ();
 
 
        Open_Input_File4 ();
        File_First_Lec ();
        while (!File_Lec ());
        File_Lec ();
        Open_Output_File4 ();
        Write_Inf_To_File4 ();
        
 
        printf("\nEnter 1 to reexecute the program, or any other symbol to quit\n");
        printf("\n");
        scanf("%c", &inp);
    } while (inp == '1');
 
    return 0;
}
 
int Open_Input_File1() {
    f_point = fopen("C:/Users/admin/Desktop/KPI/laba9_10vvod/prof.txt", "r");
    if (f_point == NULL) {
        printf("File with input data wasn't found");
        return 1;
    }
    return 0;
}
 
int Open_Input_File2() {
    d_point = fopen("C:/Users/admin/Desktop/KPI/laba9_10vvod/doc.txt", "r");
    if (d_point == NULL) {
        printf("File with input data wasn't found");
        return 1;
    }
    return 0;
}
 
int Open_Input_File3() {
    a_point = fopen("C:/Users/admin/Desktop/KPI/laba9_10vvod/assist.txt", "r");
    if (a_point == NULL) {
        printf("File with input data wasn't found");
        return 1;
    }
    return 0;
}
int Open_Input_File4() {
    l_point = fopen("C:/Users/admin/Desktop/KPI/laba9_10vvod/lect.txt", "r");
    if (l_point == NULL) {
        printf("File with input data wasn't found");
        return 1;
    }
    return 0;
}
 
 
int File_First_Prof() {
    list_length = 1;
    prof_amount = 1;
    first_pr = (struct prof*)malloc(sizeof(struct prof));
    if (first_pr == NULL) {
        printf("\nNULL pointer for first_pr");
        return 1;
    }
    cur_pr = first_pr;
    fscanf (f_point, "%s", first_pr->university);
    fscanf (f_point, "%s", first_pr->posada);
    fscanf (f_point, "%s", first_pr->zvannya);
    fscanf (f_point, "%s", first_pr->name);
 
    return 0;
}
 
int File_First_Doc() {
    list_length = 1;
    doc_amount = 1;
    first_doc = (struct doc*)malloc(sizeof(struct doc));
    if (first_doc == NULL) {
        printf("\nNULL pointer for first_doc");
        return 1;
    }
    cur_doc = first_doc;
    
    fscanf (d_point, "%s", first_doc->university);
    fscanf (d_point, "%s", first_doc->posada);
    fscanf (d_point, "%s", first_doc->zvannya);
    fscanf (d_point, "%s", first_doc->name);
 
    return 0;
}
 
int File_First_Ass() {
    list_length = 1;
    assist_amount = 1;
    first_ass = (struct assistant*)malloc(sizeof(struct assistant));
    if (first_ass == NULL) {
        printf("\nNULL pointer for first_ass");
        return 1;
    }
    cur_ass = first_ass;
    
    fscanf(a_point, "%s", first_ass->university);
    fscanf(a_point, "%s", first_doc->ktn);
    fscanf(a_point, "%s", first_doc->name);
 
    return 0;
}
 
int File_First_Lec() {
    list_length = 1;
    assist_amount = 1;
    first_lec = (struct lecturer*)malloc(sizeof(struct lecturer));
    if (first_ass == NULL) {
        printf("\nNULL pointer for first_doc");
        return 1;
    }
    cur_ass = first_ass;
    
    fscanf(l_point, "%s", first_ass->university);
    fscanf(l_point, "%s", first_ass->ktn);
    fscanf(l_point, "%s", first_ass->name);
 
    return 0;
}
 
 
int File_Prof() {
    
    next_pr = (struct prof*)malloc(sizeof(struct prof));
    if (next_pr == NULL) {
        printf("\nNULL pointer for next_pr");
        return 1;
    }
    if (feof(f_point)) {
        //free (next_st);
        cur_pr->next_prof = NULL;
        fclose (f_point);
        return 1;
    }
 
    fscanf(f_point, "%s", first_pr->university);
    prof_amount++;
    fscanf(f_point, "%s", first_pr->posada);
    fscanf(f_point, "%s", first_pr->zvannya);
    fscanf(f_point, "%s", first_pr->name);
 
    cur_pr->next_prof = next_pr;
    cur_pr = next_pr;
    list_length++;
    return 0;
}
 
int File_Doc() {
    
    next_doc = (struct doc*)malloc(sizeof(struct doc));
    if (next_doc == NULL) {
        printf("\nNULL pointer for next_doc");
        return 1;
    }
    if (feof(d_point)) {
        //free (next_st);
        cur_doc->next_docent = NULL;
        fclose(d_point);
        return 1;
    }
 
 
    
    fscanf(d_point, "%s", first_doc->university);
    doc_amount++;
    fscanf(d_point, "%s", first_doc->posada);
    fscanf(d_point, "%s", first_doc->zvannya);
    fscanf(d_point, "%s", first_doc->name);
 
    cur_doc->next_docent = next_doc;
    cur_doc = next_doc;
    list_length++;
    return 0;
}
 
int File_Ass() {
    next_ass = (struct assistant*)malloc(sizeof(struct assistant));
    if (next_ass == NULL) {
        printf("\nNULL pointer for next_ass");
        return 1;
    }
    if (feof(a_point)) {
        //free (next_ass);
        cur_ass->next_assistant = NULL;
        fclose(a_point);
        return 1;
    }
    
 
 
    fscanf(a_point, "%s", first_ass->university);
    assist_amount++;
    fscanf(a_point, "%s", first_ass->ktn);
    fscanf(a_point, "%s", first_ass->name);
 
    cur_ass->next_assistant = next_ass;
    cur_ass = next_ass;
    list_length++;
    return 0;
 
}
 
int File_Lec() {
    next_lec = (struct lecturer*)malloc(sizeof(struct lecturer));
    if (next_lec == NULL) {
        printf("\nNULL pointer for next_lec");
        return 1;
    }
    if (feof(l_point)) {
        //free (next_lec);
        cur_lec->next_lecturer = NULL;
        fclose(l_point);
        return 1;
    }
    
 
 
    fscanf(l_point, "%s", first_ass->university);
    senior_amount++;
    fscanf(l_point, "%s", first_ass->ktn);
    fscanf(l_point, "%s", first_ass->name);
 
    cur_lec->next_lecturer = next_lec;
    cur_lec = next_lec;
    list_length++;
    return 0;
 
}
 
int Open_Output_File1() {
    f_point = fopen("C:/Users/admin/Desktop/KPI/laba9_10vvod/out_prof.txt", "w");
    if (f_point == NULL) {
        printf("File with input data wasn't found");
        return 1;
    }
    return 0;
}
 
int Open_Output_File2() {
    d_point = fopen("C:/Users/admin/Desktop/KPI/laba9_10vvod/out_doc.txt", "w");
    if (d_point == NULL) {
        printf("File with input data wasn't found");
        return 1;
    }
    return 0;
}
 
int Open_Output_File3() {
    a_point = fopen("C:/Users/admin/Desktop/KPI/laba9_10vvod/out_assist.txt", "w");
    if (a_point == NULL) {
        printf("File with input data wasn't found");
        return 1;
    }
    return 0;
}
 
int Open_Output_File4() {
    l_point = fopen("C:/Users/admin/Desktop/KPI/laba9_10vvod/out_lect.txt", "w");
    if (l_point == NULL) {
        printf("File with input data wasn't found");
        return 1;
    }
    return 0;
}
 
 
void Write_Inf_To_File1() {
    cur_pr = first_pr;
    
    fprintf(f_point, " | university     | posada     | zvannya     | name      |\n"
        "|----------------+------------+----------------+-------------|\n");
    do {
        fprintf(f_point, "| %14s | %10s | %10s | %8s |\n", cur_pr->university, cur_pr->posada, cur_pr->zvannya, cur_pr->name);
        struct prof *temp;
        temp = cur_pr;
        cur_pr = cur_pr->next_prof;
        free(temp);
    } while (cur_pr != NULL);
    
    fflush(f_point);
    fclose(f_point);
}
 
void Write_Inf_To_File2() {
    cur_doc = first_doc;
 
    fprintf(d_point, " | university     | posada     | zvannya     | name      |\n"
        "|----------------+------------+----------------+-------------|\n");
    do {
        fprintf(d_point, "| %14s | %10s | %10s | %8s |\n", cur_doc->university, cur_doc->posada, cur_doc->zvannya, cur_doc->name);
        struct doc *temp;
        temp = cur_doc;
        cur_doc = cur_doc->next_docent;
        free(temp);
    } while (cur_doc != NULL);
 
    fflush(d_point);
    fclose(d_point);
}
 
void Write_Inf_To_File3() {
    cur_ass = first_ass;
 
    fprintf(a_point, " | university     | ktn     | name      |\n"
        "|-------------+--------------+-------------|\n");
    do {
 
        fprintf(a_point, "| %14s | %10s | %8s |\n", cur_ass->university, cur_ass->ktn, cur_ass->name);
        struct assistant *temp;
        temp = cur_ass;
        cur_ass = cur_ass->next_assistant;
        free(temp);
    } while (cur_ass != NULL);
    
    fflush(a_point);
    fclose(a_point);
}
 
void Write_Inf_To_File4() {
    cur_lec = first_lec;
 
    fprintf(l_point, " | university     | ktn     | name      |\n"
        "|-------------+--------------+-------------|\n");
    do {
 
        fprintf(l_point, "| %14s | %10s | %8s |\n", cur_lec->university, cur_lec->ktn, cur_lec->name);
        struct lecturer *temp;
        temp = cur_lec;
        cur_lec = cur_lec->next_lecturer;
        free(temp);
    } while (cur_lec != NULL);
    
    fflush(l_point);
    fclose(l_point);
}