Array ( [0] => tirupur )
Array ( [0] => coimbatore )
Array ( [0] => coimbatore [1] => chennai )
Array ( [0] => coimbatore [1] => chennai [2] => madurai )
Array ( [0] => bangalore )
最終的な配列を以下の出力のようにしたい
Array ( [0] => tirupur [1]=>coimbatore [2]=>chennai [3]=>madurai [4]=>bangalore)