Build snake and ladder

• A Board of configurable size (default 10 x 10) with snakes and ladders given as head-to-tail and bottom-to-top pairs; validate that no square holds two jumps, no jump starts at the last square, and no jump is a loop
• A Dice abstraction (default one six-sided die) that can be replaced by a deterministic or multi-dice implementation for testing
• Support two or more players taking turns in a fixed order
• A move rolls the dice, advances the player, and applies a snake or ladder at the landing square (chained jumps resolve until a plain square)
• Exact finish rule: a roll that would pass the last square leaves the player in place
• The first player to land exactly on the last square wins and the game ends; further moves are rejected
• A move result reports the roll, from and to squares, any jump taken, and the winner if any

Only after every requirement works.

• Configurable rules: extra turn on a six, or three sixes in a row loses the turn
• Support multiple winners with ranking until all but one player finish
• Pluggable dice and board loaders from JSON