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

    // concatenates two strings
    char *concat (const char *s1, const char *s2)
    {
        char *result = NULL;
        
        result = malloc(strlen(s1) + strlen(s2) + 1);
        if (result == NULL)
                return NULL;

        strcpy(result, s1);
        strcat(result, s2);

        return result;
    }

    int main(void)
    {
        char *p = NULL;
        
        p = concat("Ena st", "ring.");
        if ( p == NULL )
        {
            printf("Error: malloc failed in concat\n");
            exit(EXIT_FAILURE);
        }

        p[1] = 'o';
        puts(p);

        free(p);
        return 0;
    }