zaras sie zdenerwuje

#include <stdio.h>
#include <string.h>
#include <stdlib.h>
#include <sys/types.h>
#include <unistd.h>

int main(int argc, char *argv[])
{
    int status;
    if(argc!=2)
    {
        fprintf(stderr,"Error1\n");
        exit(1);
    }
    int length=strlen(argv[1]);
    if(length>20)
    {
        fprintf(stderr,"Error2\n");
        exit(1);
    }
    if (length%2==0)
    {
        char *tab1 [length/2];
        char *tab2 [length/2];
        printf("Jestem tu 1\n");
        strncpy(tab1,argv[1],length/2);
        strncpy(tab2,argv[1]+length/2,length/2);
        //printf("%s\n",tab1);
        //printf("%s\n",tab2);

        //Pierwszy potomek
        pid_t cpid = fork();
        if (cpid>0)
        {
            //Drugi potomek
            pid_t ccpid = fork();
            if (ccpid>0)
            {
                waitpid(cpid,&status,0);
                waitpid(ccpid,&status,0);
                printf("%d\t%d\t%s\n",getpid(),cpid,tab1);
                printf("%d\t%d\t%s\n",getpid(),ccpid,tab2);
            }
            else
            {
                execlp(argv[0],argv[0],tab2);
            }
        }
        else
        {
            execlp(argv[0],argv[0],tab1);
        }

    }
    if (length%2==1)
    {
        char tab1[length/2];
        char tab2[length/2+1];
        printf("Jestem tu 2\n");
        strncpy(tab1,argv[1],length/2);
        strncpy(tab2,argv[1]+length/2,length/2+1);
        //printf("%s\n",tab1);
        //printf("%s\n",tab2);
    }
}