strdupl.c

#include <stdlib.h>
char *strdupl(char const *str)
{
    char *new;
    int i;
    
    i = 0;
    while (str && str[i] && ++i);
    if (!(new = malloc(sizeof(char) * (i + 1))))
        return (NULL);
    new[i] = 0;
    while (--i >= 0)
        new[i] = str[i];
    return (new);
}