add new c rewrite

src/main.c

@@ -0,0 +1,11 @@
+
+
+#include <stdio.h>
+
+int main() {
+    FILE *ffmpeg = popen("ffmpeg -i ", "rw");
+    if (!ffmpeg) return -1;
+    printf("hello world\n");
+    pclose(ffmpeg);
+    return 0;
+}