No terminal ficou mais bonito que aqui, mais definido.
void abertura(){
printf(" ************************************************************************ \n");
printf(" -+ Bem vindo ao +- \n\n");
printf(" | | | | |_____| \n");
printf(" | | ___ __ _ ___ __| | __ _ | |__ ___ _ __ ___ __ _ \n");
printf(" _ | |/ _ \\ / _` |/ _ \\ / _` |/ _` | | __/ _ \\| '__/ __/ _` | \n");
printf(" | |__| | (_) | (_| | (_) | | (_| | (_| | | | | (_) | | | (_| (_| | \n");
printf(" \\____/ \\___/ \\__, |\\___/ \\__,_|\\__,_| |_| \\___/|_| \\___\\__,_|\n");
printf(" __/ | \n");
printf(" |___/ \n\n");
printf(" -+ Descobre qual a palavra secreta! +- \n");
printf(" ************************************************************************ \n");
}