#include <stdio.h>
#include <unistd.h>

void ft_putstr(char *str)
{
    while (*str)
        write(1, str++, 1);
}

void ft_ulstr(char str[])
{
    int i;
    i = 0;

    while (str[i])
        {
            if (str[i] >= 'a' && str[i] <= 'z')
                str[i] -= 32;
            else if (str[i] >= 'A' && str[i] <= 'Z')
                str[i] += 32;
           // else
           //     str[i] == str[i]; pas besoin
            i++;
        }
    //return (str); // Pas besoin de "return (str);" car la fonction est de type void
}

int main(int ac, char **av) 
{
    if (ac == 2)
    {
        ft_ulstr(av[1]);
        ft_putstr(av[1]);
        write (1, "\n", 1);
    }
    else
    {
        write (1, "\n", 1);
    }
    return 0;
}