Cleanup unused includes

src/main.c

@@ -1,10 +1,7 @@
-#include "aliases.h"
 #include "json_entities.h"
-#include "lexer.h"
 #include "parser.h"
 #include <stdio.h>
 #include <stdlib.h>
-#include <string.h>
 
 int main(int argc, char *argv[]) {
   if (argc < 2) {