Write a function map(function, seq) that models a limited version of the behavior of the built-in function.

Input: a function function and a sequence seq.

Output: a list comprising the output of function for each element in seq. The order of seq must be maintained. If seq is empty, return an empty list.

Note: Remember that a sequence can be a list, a string, a tuple, or a range, so this function must work for all these types.