Reorganize project structure

checkaddy_app/validators/evm.py

@@ -0,0 +1,14 @@
+from __future__ import annotations
+
+from ..constants import EVM_ADDRESS_RE
+
+
+def validate_evm_address(address: str) -> tuple[bool, str]:
+    address = address.strip()
+    if not EVM_ADDRESS_RE.fullmatch(address):
+        return False, "EVM address must match 0x + 40 hex characters"
+
+    body = address[2:]
+    if body.islower() or body.isupper():
+        return True, "Valid EVM hex address"
+    return True, "Valid mixed-case EVM address (checksum not verified)"