String or Not?

Test your C programming skills by solving the given puzzle about character arrays and their output.

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Puzzle code

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#include <stdio.h>
int main()
{
char nonstring[] = {
'g', 'r', 'e', 'e', 't',
'i', 'n', 'g', 's', ',', ' ', 'h', 'u', 'm', 'a', 'n'
};
char data[] = { 127, 129, 255 };
printf("%s\n", nonstring);
return(0);
}
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