i wrote a function to read line from file the function use realloc() but The program falls every time in another place when it use realloc()Or I use realloc()in other places in the program where it falls every run in another reading and the error that appears is :Exception thrown at 0x77152B4B (ntdll.dll) in 21_207986712.exe: 0xC0000005: Access violation reading location 0x00000014.

int f_getLine(FILE* source, char** str) {
    int n = 0, isFinish = 0;
    char* line = NULL, c = NULL;
    while (isFinish = fscanf(source, "%c", &c) == 1 && c != '\n')
    {

        line = (char*)realloc(line, sizeof(char) * ++n);
        line[n - 1] = c;
    }
    if (isFinish != 1 && c != '\n')
        return-1;
    line = (char*)realloc(line, sizeof(char) * ++n);
    line[n - 1] = NULL;
    *str = line;
    return n;
}

the function to "implement" preProssesor exchang define open include and skip define

char* f_preProssesor(char* source, FILE* target)
{
    char* word = NULL;
    char* define = NULL;
    char* include = NULL;
    char* str = NULL;
    int isFinish = 0;
    FILE* my_source = fopen(source, "r");
    while (isFinish = f_getLine(my_source, &str) > 0)
    {
        if (!str||!*str)
            continue;
        if (strncmp("//", str, 2) == 0) {
            continue;
        }
        while (str&&*str)
        {   //skip the note and the space
            while (*str && f_note(my_source, &str) != 0 && *str != ' ')
            {//write the space to targrt
                if (*str == ' ')
                {
                    fprintf(target, "%c", ' ');
                    printf(target, "%c", ' ');
                }
                //check the next char
                str++;
            }
            if (*str == '#')
            {
                if (include = f_findInclude(my_source, str))
                {//open the include and go to next line
                    f_preProssesor(include, target);
                    break;
                }
                else
                {//add the include and go to next line
                    f_findDefine(my_source, str);
                    break;
                }

            }
            else if (!str&&!*str)
                continue;
            else if (*str == '"')
            {//find the string
                f_writeToFile(f_findString(&str, my_source), target);
            }
            else {
                //find the word
                word = f_findWord(&str, my_source);
                //return the exchange of define
                if (define = f_exchangeDefine(word))
                    word = define;
                //write to file
                f_writeToFile(word, target);
            }
        }

        fprintf(target,"\n");
        printf("\n");
    }
    fclose(my_source);
}

this function to store the include for example:

define N 6 store in defines struct in key=N value=6

in this function the realloc fails also

void f_findDefine(FILE* my_source, char* line) {
    char* result = NULL;
    int n = 0;
    line = strstr(line, "define");
    if (!line)
        return NULL;
    line = line + 6;

    struct s_define* new_def_p = (struct s_define*)malloc(sizeof(struct s_define*));
    new_def_p->key = NULL;
    new_def_p->value = NULL;
    new_def_p->next = NULL;
    //space
    while (*line == ' ' || f_note(my_source, &line) != 0)
    {
        line++;
    }
    //first
    while (*line&&*line != ' ' || f_note(my_source, &line) != 0)
    {
        new_def_p->key = (char*)realloc(new_def_p->key, ++n * sizeof(char));
        new_def_p->key[n - 1] = *line;
        line++;
    }
    new_def_p->key = (char*)realloc(new_def_p->key, ++n * sizeof(char));
    new_def_p->key[n - 1] = '\0';
    //space
    while (*line && *line == ' ' || f_note(my_source, &line) != 0)
    {
        if (*line == ' ')
            printf("\t");
        line++;
    }
    //second
    n = 0;
    while (*line)
    {
        while (*line&& *line != '\n' && *line != '\\')
        {
            new_def_p->value = (char*)realloc(new_def_p->value, ++n * sizeof(char));
            new_def_p->value[n - 1] = *line;
            line++;
        }
        if (!*line || *line == '\n')
        {
            new_def_p->value = (char*)realloc(new_def_p->value, ++n * sizeof(char));
            new_def_p->value[n - 1] = '\0';
            f_seachDef(new_def_p);
            return;
        }
        f_getLine(my_source, &line);
    }
}

Exception thrown at 0x77152B4B (ntdll.dll) in 21_207986712.exe: 0xC0000005: Access violation reading location 0x00000014.