Touched up the Scanner. Refactored the Interpreter some more, this time it's able to be run on simple expressions. String concatenation can be performed by the Interpreter however, numbers and Booleans are not being stored correctly in the Object structures.

lox.c

@@ -1,6 +1,7 @@
 #include "scanner.h"
 #include "parser.h"
 #include "expr.h"
+#include "interpreter.h"
 #include <stdio.h>
 #include <stdlib.h>
 #include <sysexits.h>
@@ -43,6 +44,7 @@ void RunFile(const char* path) {
     Expr* tree = GenerateExpressionTree(tokens);
     PrintExpressionTree(tree);
     printf("\n");
+    Interpret(tree);
     FreeExpressionTree(tree);
     DestroyTokenList(tokens);
 }