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15 
char two_character_string[2];

//You cant do this outside a function!
two_character_string[1] = '\0';
two_character_string[0] = c;

It should be this:

char two_character_string[2] = "c";

or this:

char two_character_string[2] = {'c',0};

or this:

char two_character_string[2] = {'c','\0'};