JS: Returning booleans would be a better practice.

(C++): I have discovered a strange thing in connection with the random tests. The last string to test is a random,large string, but it differs to the others. I haven't found a button to load up a printscreen,so I will try to explain it. For example, this string was given: "yklbssfc vgvvwqdeattztahvthercnopvjgnrzkwggcdhubtwrdmuhpjjvjfhndeudi kpgqptsv kggchaucelacnifdgdzvlgidirubqdgnbcemumhfltykxoznrbgjkwqjhmrmjpbsaolcnpkqocjrqbqhxe diolsndkrxfmxz egrhdw raxxxnfsdngcfopbfyufahahxai grynjyroodcqwhdrlmcizqnipxsykzeuygpzmqwhbnfi xjiqwnpxlvtg mlpkffhgbwwcdfywihlwe ywdynjgqnhhgbe" =>There is no space(!) in the text when I see it in the cerr screen, I just wanted to highlight the positions there! On those positions there is a special character(?) or I don't know what...but when I wanted to copy the whole text from cerr, I couldn't do it only in pieces and the borders of the pieces were according to the mentioned positions. When I merged these pieces and run my solution in my local machine I get the expected result, but here I can't run it correctly, because of these special something. So, I can't submit my correct solution.
Anyway,if I inspect the element or the source of the text in the browser, I can also see special signs in the mentioned positions.
Is it something to be corrected in the test case? Or how should I solve this problem? Because I have a correct solution,but I can't submit it, because of this. Thanks.