Implement competitive item snatching system

- Add dropped items tracking with timestamps per channel
- Items drop to ground (10% chance on duck kills) for any player to grab
- Add 60-second timeout for unclaimed items
- Background cleanup task removes expired items automatically
- First-come-first-served basis for item collection
- Eggdrop-style messaging for drops and successful snatches

src/utils.py

@@ -0,0 +1,63 @@
+#!/usr/bin/env python3
+"""
+Utility functions for DuckHunt Bot
+"""
+
+import re
+from typing import Optional
+
+
+class InputValidator:
+    """Input validation utilities"""
+    
+    @staticmethod
+    def validate_nickname(nick: str) -> bool:
+        """Validate IRC nickname format"""
+        if not nick or len(nick) > 30:
+            return False
+        # RFC 2812 nickname pattern
+        pattern = r'^[a-zA-Z\[\]\\`_^{|}][a-zA-Z0-9\[\]\\`_^{|}\-]*$'
+        return bool(re.match(pattern, nick))
+    
+    @staticmethod
+    def validate_channel(channel: str) -> bool:
+        """Validate IRC channel format"""
+        if not channel or len(channel) > 50:
+            return False
+        return channel.startswith('#') and ' ' not in channel
+    
+    @staticmethod
+    def validate_numeric_input(value: str, min_val: Optional[int] = None, max_val: Optional[int] = None) -> Optional[int]:
+        """Safely parse and validate numeric input"""
+        try:
+            num = int(value)
+            if min_val is not None and num < min_val:
+                return None
+            if max_val is not None and num > max_val:
+                return None
+            return num
+        except (ValueError, TypeError):
+            return None
+    
+    @staticmethod
+    def sanitize_message(message: str) -> str:
+        """Sanitize user input message"""
+        if not message:
+            return ""
+        # Remove control characters and limit length
+        sanitized = ''.join(char for char in message if ord(char) >= 32 or char in '\t\n')
+        return sanitized[:500]  # Limit message length
+
+
+def parse_message(line):
+    """Parse IRC message format"""
+    prefix = ''
+    trailing = ''
+    if line.startswith(':'):
+        prefix, line = line[1:].split(' ', 1)
+    if ' :' in line:
+        line, trailing = line.split(' :', 1)
+    parts = line.split()
+    command = parts[0] if parts else ''
+    params = parts[1:] if len(parts) > 1 else []
+    return prefix, command, params, trailing