Added code

modules/config/__init__.py

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+from .config import charset

modules/config/config.py

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+import json
+
+try:
+    config = json.load(open('config.json', encoding='utf-8'))
+except:
+    config = {
+        "charset": "abcdefghijklmnopqrstuvwxyz"
+    }
+    json.dump(config, open('config.json', 'w', encoding='utf-8'), indent=4)
+
+charset = ''.join(sorted(list(set(' ' + config['charset']))))

modules/generator/__init__.py

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+from .pages import Page, Index

modules/generator/pages.py

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+from modules.config import charset
+from ezzthread import threaded
+
+
+def encode(n):
+    try:
+        return charset[n]
+    except IndexError:
+        raise Exception(f"Cannot encode {n}")
+
+
+def decode(s):
+    try:
+        return charset.index(s)
+    except ValueError:
+        raise Exception(f"Cannot decode {s}")
+
+
+def dec_to_base(dec=0, base=16):
+    if dec < base:
+        return encode(dec)
+    else:
+        return dec_to_base(dec // base, base) + encode(dec % base)
+
+
+def base_to_dec(s, base=16, rec_pow=0):
+    if s == str():
+        return 0
+    else:
+        return decode(s[-1]) * (base ** rec_pow) + base_to_dec(s[0:-1], base, rec_pow + 1)
+
+
+class Page:
+    @staticmethod
+    def from_index(index: int) -> str:
+        return dec_to_base(index, len(charset))
+
+
+class Index:
+    @staticmethod
+    def from_page(page: str) -> int:
+        return base_to_dec(page, len(charset))