jolly me syntax error in c on linux debian cli inside virtualbox

this is my problem

#include <stdio.h>int main(){printf("hello world");return 0;}

denian:example# ./main.c./main.c: line 2: syntax error near unexpected token (' ./main.c: line 2: int main()'

device:windowsvirtualboxlinux debian (cli)c programing language

help please.....