#include <stdio.h>
// TODO: Include the approriate headers
#include <stdlib.h>
char* concat(char* first, char* second)
{
    // TODO: allocate dynamic memory and copy both strings to it 
    char* both = malloc(sizeof(char) * 13);
    int x = 0;
    while (first[x] != 0) {
        both[x] = first[x];
        x++;
    }
    int y = 0;
    while (second[y] != 0) {
        both[x + y] = second[y];
        y++;
    }
    return both;
}
int main(int argc, const char *argv[])
{
    char hello[] = "Hello";
    char world[] = "World!";

    char* out = concat(hello, world);
    printf("%s", out);
}