Question: Modify merge_arrays () so that it eliminates duplicate entries. Write a function called strcat () that appends one string to another. The function should accept

Modify merge_arrays () so that it eliminates duplicate entries.

Write a function called strcat () that appends one string to another. The function should accept two arguments that are pointers to strl and str2 and return a pointer to the first character in strl. Make sure to over-write the null character in strl.

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