Merge pull request #64 from UB-CSE443/tests

Tests

src/symbol_table.c

@@ -1212,6 +1212,14 @@ TableNode *table_lookup(SymbolTable *table, char *x) {
     }
     TableNode *entrie = table->entries;
     for (; entrie != NULL; entrie = entrie->next) {
+        if (entrie->theName == NULL) {
+            printdebug("name of entry is currently NULL, undefined");
+            return undefined;
+        }
+        if (entrie->theName == undefined->theName) {
+            printdebug("name of entry is currently undefined");
+            return undefined;
+        }
         if (!strcmp(entrie->theName, x)) {
             return entrie;
         }