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

char *conct(char *s1, const char *s2)
{
    char *storage = malloc(strlen(s1) + strlen(s2) + 1);
    strcpy(storage, s1);
    strcat(storage, s2);
    return storage;
}

int main()
{
    char *s = conct("Fuc", "ker");
    printf("%s\n", s);
    free(s);
}