#include <stdio.h>
#include <stdlib.h>
#include <string.h>

char *safecat(char *s, const char *ct)
{
    char *p;
    unsigned int i;
    p = realloc(s, sizeof(s) + sizeof(ct) - 1); /* only allocate space for one '\0' */
    if (p == NULL){
        return NULL;
    }
    s = p; /* p now also points to first element */
    while(*p != '\0') p++;
    for(i = 0; i < strlen(ct); i++){
        *(p + i) = ct[i];
    }
    *(p + i) = '\0';
    return s;
}


int main()
{
    char *str1 = "Twin";
    char *str2 = "Peaks";
    str1 = safecat(str1, str2);
    if (str1 == NULL){
        printf("Error: Could not connect strings\n");
        free(str1);
        return 1;
    }
    printf("%s\n", str1);
    return 0;
}