Add solution for Challenge 6 by lajosbnk #10

Job	Run time
Validate Submission Security	5s
test-submissions (challenge-2)	27s
test-submissions (challenge-3)	23s
test-submissions (challenge-5)	11s
test-submissions (challenge-4)	12s
test-submissions (challenge-6)	20s
test-submissions (challenge-8)	11s
test-submissions (challenge-9)	13s
test-submissions (challenge-7)	16s
test-submissions (challenge-14)	15s
test-submissions (challenge-15)	14s
test-submissions (challenge-10)	16s
test-submissions (challenge-12)	11s
test-submissions (challenge-11)	20s
test-submissions (challenge-20)	17s
test-submissions (challenge-13)	13s
test-submissions (challenge-26)	11s
test-submissions (challenge-1)	26s
test-submissions (challenge-21)	15s
test-submissions (challenge-18)	15s
test-submissions (challenge-17)	13s
test-submissions (challenge-25)	20s
test-submissions (challenge-16)	19s
test-submissions (challenge-22)	12s
test-submissions (challenge-23)	10s
test-submissions (challenge-29)	12s
test-submissions (challenge-30)	15s
test-submissions (challenge-19)	14s
test-submissions (challenge-28)	23s
test-submissions (challenge-24)	11s
test-submissions (challenge-27)	11s
	7m 51s

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