お題：文字列を先頭から見て同じところまで除去

gistfile1.groovy

def hoge(String... args) {
    def i = -1, v = ''
    while(++i < args*.size().min() && args.every{it[i] == args[0][i]}) {
        v += args[0][i]
    }
    args*.minus(v)
}

assert hoge('123', '123') == ['','']
assert hoge('112233', '123123') == ['12233', '23123']
assert hoge('なまむぎ', 'なまごめ', 'なまたまご') == ['むぎ', 'ごめ', 'たまご']
assert hoge('abcde', 'abcdefg') == ['', 'fg']
assert hoge('abcdefg', 'abcde') == ['fg', ''] // 追加したテスト


// お題
assert hoge('abcdef', 'abc123') == ['def', '123']
assert hoge("あいうえお", "あいさんさん", "あいどる") == ["うえお", "さんさん", "どる"]
assert hoge("12345", "67890", "12abc") == ["12345", "67890", "12abc" ]