1. (20%) What would line 6 of the following C program fragment be after preprocessing? (Show all spaces by using indicate a space! For instance, write "y" as "n--y" to indicate that there are two spaces between x and y.) 22 # ### 1 #define hash_hash # ### 2 #define mkstr(a) # 3 #define in_between(a) mkstr(a) 4 #define join(c, a) in_between(c hash_hash d) a 5 6 join(x, y)