diff --git a/README.md b/README.md
index dc612bc..54b093f 100644
--- a/README.md
+++ b/README.md
@@ -1,16 +1,3 @@
 # SCL: Simple Calculator Language
 
-Project structure:
-
-```bash
-$ tree -d
-.
-├── build       # Build directory; where binaries (except the main one) go.
-│   ├── obj     # Project objects.
-│   └── test    # Test build directory.
-│       └── obj # Test objects.
-├── src         # Source files (*.c).
-│   └── include # Header files (*.h)
-└── test        # Tests (file names match those in src/*.c).
-    └── unity   # Unity test framework files.
-```
+A rewrite of halk.
diff --git a/src/include/lexer.h b/src/include/lexer.h
index d5ec072..d5791fe 100644
--- a/src/include/lexer.h
+++ b/src/include/lexer.h
@@ -21,7 +21,7 @@ typedef struct {
     char* cchar;      // The current character.
     Token** tokens;   // The tokens produced.
     size_t ntokens;   // The number of tokens.
-    LexerState state; // What the lexxer is looking at.
+    LexerState state; // What the lexer is looking at.
 } Lexer;
 
 // Create a lexer.
@@ -42,4 +42,7 @@ void lexer_do_call(Lexer* lexer);
 // Convert text to tokens.
 void lexer_lex(Lexer* lexer);
 
+// Add a token to the lexer.
+void lexer_add_token(Lexer* lexer, Token* token);
+
 #endif
diff --git a/src/lexer.c b/src/lexer.c
index d5b6946..fe225cf 100644
--- a/src/lexer.c
+++ b/src/lexer.c
@@ -1,4 +1,6 @@
 #include "include/lexer.h"
+#include "include/token.h"
+#include <stdlib.h>
 
 Lexer* lexer_init(char* src) {
     Lexer* lexer = malloc(sizeof(Lexer));
@@ -20,7 +22,15 @@ void lexer_destroy(Lexer* lexer) {
     for (int i = 0; i < lexer->ntokens; token_destroy(lexer->tokens[i++]));
 }
 
-void lexer_do_confused(Lexer* lexer) {}
+void lexer_do_confused(Lexer* lexer) {
+    int c = atoi(lexer->cchar);
+
+    if (c) lexer_add_token(lexer, token_init(TOKEN_TYPE_NUMBER, lexer->cchar));
+    else lexer_add_token(lexer, token_init(TOKEN_TYPE_CALL, lexer->cchar));
+}
+
+void lexer_do_number(Lexer* lexer) {}
+void lexer_do_call(Lexer* lexer) {}
 
 void lexer_lex(Lexer* lexer) {
     while (*lexer->cchar) {
@@ -32,3 +42,8 @@ void lexer_lex(Lexer* lexer) {
         }
     }
 }
+
+void lexer_add_token(Lexer* lexer, Token* token) {
+    (void)reallocarray(lexer->tokens, lexer->ntokens++, sizeof(Token));
+    lexer->tokens[lexer->ntokens-1] = token;
+}
diff --git a/test/main.c b/test/main.c
index 7a793a0..e576d4c 100644
--- a/test/main.c
+++ b/test/main.c
@@ -1,5 +1,5 @@
-#include "unity/unity.h"
 #include "registry.h"
+#include "unity/unity.h"
 
 void (*tests[30])();
 
diff --git a/test/registry.c b/test/registry.c
index bef64c5..9edcb45 100644
--- a/test/registry.c
+++ b/test/registry.c
@@ -1,5 +1,5 @@
-#include "unity/unity_internals.h"
 #include "registry.h"
+#include "unity/unity_internals.h"
 
 #define TESTS_MAX 128
 
@@ -7,13 +7,14 @@ static Test tests[TESTS_MAX];
 static int test_count = 0;
 
 void register_test(Test t) {
-  if (test_count < TESTS_MAX) {
-      tests[test_count] = t;
-      test_count++;
-  } else
-    printf("Maximum number of tests (%d) exceeded.\n", TESTS_MAX);
+    if (test_count < TESTS_MAX) {
+        tests[test_count] = t;
+        test_count++;
+    } else printf("Maximum number of tests (%d) exceeded.\n", TESTS_MAX);
 }
 
 void run_all_tests() {
-  for (int i = 0; i < test_count; i++) tests[i]();
+    for (int i = 0; i < test_count; i++) {
+        int res = tests[i]();
+    }
 }
diff --git a/test/registry.h b/test/registry.h
index c964751..bb5d299 100644
--- a/test/registry.h
+++ b/test/registry.h
@@ -2,12 +2,12 @@
 #define REGISTRY_H
 
 #include <stdio.h>
+#include "unity/unity.h"
 
-// Test functions neither consume nor return anything.
-typedef void (*Test)(void);
+typedef int (*Test)(void);
 
 // Register a new test function.
-void register_test(Test t);
+void register_test(Test);
 
 // Run all registered tests.
 void run_all_tests();
diff --git a/test/token.c b/test/token.c
index 4938614..a83466f 100644
--- a/test/token.c
+++ b/test/token.c
@@ -1,31 +1,19 @@
-#include <stdlib.h>
 #include "unity/unity.h"
+#include <stdlib.h>
 
-#include "registry.h"
-#include "unity/unity_internals.h"
 #include "../src/include/token.h"
+#include "registry.h"
 
-void test_token_init() {
+int test_token_init() {
+    UNITY_BEGIN();
     char* s = malloc(sizeof("Hello, world!"));
     s = "Hello, world!";
     Token* t = token_init(TOKEN_TYPE_CALL, s);
     TEST_ASSERT_EQUAL(TOKEN_TYPE_CALL, t->type);
     TEST_ASSERT_EQUAL_STRING("Hello, world!", t->val);
-}
-
-void test_token_destroy() {
-    char* s = malloc(1 * sizeof(char));
-    *s = 'h';
-    Token* t = token_init(TOKEN_TYPE_CALL, s);
-    token_destroy(t);
-}
-
-void token_test() {
-    UNITY_BEGIN();
-    RUN_TEST(test_token_init);
-    UNITY_END();
+    return UNITY_END();
 }
 
 __attribute__((constructor)) void register_tests_token() {
-    register_test(token_test);
+    register_test(test_token_init);
 }
diff --git a/test/util.c b/test/util.c
index 5eef12e..737c660 100644
--- a/test/util.c
+++ b/test/util.c
@@ -1,19 +1,14 @@
-#include "unity/unity.h"
-#include "registry.h"
-#include "unity/unity_internals.h"
 #include "../src/include/util.h"
+#include "registry.h"
+#include "unity/unity.h"
 
-void test_is_even() {
+int test_is_even() {
+    UNITY_BEGIN();
     TEST_ASSERT_EQUAL(0, is_even(1));
     TEST_ASSERT_EQUAL(1, is_even(2));
-}
-
-void util_test() {
-    UNITY_BEGIN();
-    RUN_TEST(test_is_even);
-    UNITY_END();
+    return UNITY_END();
 }
 
 __attribute__((constructor)) void register_tests_util() {
-    register_test(util_test);
+    register_test(test_is_even);
 }