Given a one word lowercase string $s, return another string such that even-indexed and odd-indexed characters are grouped and groups are space-separated.
evenOddString("mubashir") ➞ "mbsi uahr"
// Letters at even indexes = "mbsi"
// Letters at odd indexes = "uahr"
// Join both strings with a space
evenOddString("edabit") ➞ "eai dbt"
evenOddString("airforce") ➞ "aroc ifre"There will be no space in the given string.