In Lua, write a function concatMax. This function takes a string and an integer. It returns a string, which is the concatenation of as many copies of the given string as possible, without the length exceeding the given integer. If the given integer is less than the length of the given string, then it returns the empty string.

Examples:

• concatMax("abc", 13) returns "abcabcabcabc". This is the concatenation of 4 copies of "abc". One more copy would result in length 15, which is greater than the given value 13.
• concatMax("aardvark", 20) returns "aardvarkaardvark".
• concatMax("aardvark", 10) returns "aardvark".
• concatMax("aardvark", 5) returns "" (the empty string).