feat: basic lexer + parser with basic example

include/string.hpp

@@ -0,0 +1,47 @@
+#pragma once
+#include <cstddef>
+
+struct StringView
+{
+    size_t size;
+    const char* data;
+public:
+    StringView()
+    {
+        data = nullptr;
+        size = 0;
+    }
+
+    StringView(const char* data, size_t size)
+    {
+        this->data = data;
+        this->size = size;
+    }
+};
+
+struct StringBuilder
+{
+    size_t size;
+    size_t capacity;
+    char* data;
+public:
+    StringBuilder()
+    {
+        size = 0;
+        capacity = 10;
+        data = (char*)malloc(capacity * sizeof(char));
+    }
+private:
+    void ensureSize(size_t newSize)
+    {
+        if (newSize <= capacity) return;
+        capacity = capacity + (capacity / 2);
+        data = (char*)realloc(data, capacity * sizeof(char));
+    }
+public:
+    void PushChar(char c)
+    {
+        ensureSize(size + 1);
+        data[size++] = c;
+    }
+};