Implement 'make-string'

make-string should return a string of length n. If char is supplied, the string is filled with n occurrences of char, otherwise the characters contained in the string are unspecified.
http://www.scheme.com/tspl4/objects.html#./objects:s218

(make-string 0)

Traceback (most recent call last):
File "stdin", line 1, col 2
RunTimeError: unbound variable 'make-string'

(make-string 5 #\x)

Traceback (most recent call last):
File "stdin", line 1, col 2
RunTimeError: unbound variable 'make-string'

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