file_count- lists the amount of files in a directory

file_count.c

// file_count will add one to the count because zero is reserved for errors
size_t file_count(const char* dir_nm){
    DIR* dir=opendir(dir_nm);
    if(!dir)return 0;
    struct dirent* entity=readdir(dir);
    size_t count=0;
    for(;readdir(dir);count++);
    closedir(dir);
    return count;
}