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lazenca0x0@ubuntu:~/ASM$ gcc -o shellshellcode -fno-stack-protector -z execstack --no-pie -m32 testshellcode.c
test.c:5:15: warning: array 'code' assumed to have one element
 unsigned char code[];
               ^
lazenca0x0@ubuntu:~/ASM$ ./shell 
Shellcode len : 2
Segmentation fault (core dumped)
lazenca0x0@ubuntu:~/ASM$ 

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

unsigned char shellcode [] = "\xeb\x15\x59\x31\xc0\xb0\x04\x31\xdb\xb3\x01\x31\xd2\xb2\x0f\xcd\x80\xb0\x01\x31\xdb\xcd\x80\xe8\xe6\xff\xff\xffHello, world!\n\r";
unsigned char code[] = "";

void main()
{
	int len = strlen(shellcode);
	printf("Shellcode len : %d\n",len);
	strcpy(code,shellcode);
	(*(void(*)()) code)();
}

lazenca0x0@ubuntu:~/ASM$ gcc -o shellshellcode2 -fno-stack-protector -z execstack --no-pie -m32 testshellcode2.c
lazenca0x0@ubuntu:~/ASM$ ./shellshellcode2 
Shellcode len : 43
Hello, world!
lazenca0x0@ubuntu:~/ASM$