void reverse_string(char s[]) {
    for (int i = strlen(s) - 1; i > -1; i--) {
       printf("%c", s[i]);
   }
}

void reverse_string(char *s) {
    size_t len = strlen(s);
    char *t = s + len - 1;

    while (t >= s) {
     printf("%c", *t);
     t = t - 1;
    }

    puts("");
}

#include <string.h>  // strlen()
#include <stdio.h>   // putchar()

void print_reverse(char const *str)
{
    for (char const *p = str + strlen(str); p != str; putchar(*--p));
    putchar('n');
}

#include <stddef.h>  // size_t
#include <string.h>  // strlen()
#include <stdio.h>   // putchar()

void print_reverse(char const *str)
{
    for (size_t i = strlen(str); i; putchar(str[--i]));
    putchar('n');
}

void reverse_string(const char *s) {
    const char *t = s + strlen(s);

    if (t > s) {
        for (;;) {
            t--;
            putchar(*t);
            if (t == s)
                break;
        }
    }
    putchar('n');
}

void reverse_string(char s[]) {
    for (size_t i = strlen(s); i-- > 0;) {
        putchar(s[i]);
    }
    putchar('n');
}