/**
 * copy-2.c
 *
 * David J. Malan
 * malan@harvard.edu
 *
 * Copies a string.
 *
 * Demonstrates pointer arithmetic.
 */
       
#include <cs50.h>
#include <ctype.h>
#include <stdio.h>
#include <string.h>

int main(void)
{
    // get line of text
    printf("Say something: ");
    char* s = GetString();
    if (s == NULL)
    {
        return 1;
    }

    // allocate enough space for copy
    char* t = malloc((strlen(s) + 1) * sizeof(char));
    if (t == NULL)
    {
        return 1;
    }

    // copy string, including '\0' at end
    for (int i = 0, n = strlen(s); i <= n; i++)
    {
        *(t + i) = *(s + i);
    }

    // change copy
    printf("Capitalizing copy...\n");
    if (strlen(t) > 0)
    {
        *t = toupper(*t);
    }

    // print original and copy
    printf("Original: %s\n", s);
    printf("Copy:     %s\n", t);

    // success
    return 0;
}