How do I fix my error? Bellow is my code and error.

Submit for grading 4 submissions left Latest submission 11:32 PM on 03/05/18 Total score: 0/100 Download this submission Failed to compile /usr/lib/gcc/x86 64-linux-gnu/6/..1.1./x86 64-1inux-gnu/crt1.o: In function start': (text+0x20): undefined reference co main' collect2: error: ld returned 1 exit status 5 previous submissions 11:22 PM on 3/5/18 11:22 PM on 3/5/18 11:12 PM on 3/5/18 11:09 PM on 3/5/18 10:57 PM on 3/5/18 0/100 0/100 0/100 0/100 0/100 View v View View View View