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Write a C program that takes two sets of characters entered by the user and merge them character by character.

Enter the first set of characters: dfn h ate Enter the second set of characters: eedtecsl Output: defend the castle

Your program should include the following function:

void merge(char *s3, char *s1, char *s2);

The function expects s3 to point to a string containing a string that combines s1 and s2 letter by letter. The first set might be longer or shorter than the second set. The characters in s1 or s2 left after merging should be appended to the resulting string s3.

1) Assume each input is no longer than 1000 characters.

2) The merge function should use pointer arithmetic (instead of array subscripting). In other words, eliminate the loop index variables and all use of the [] operator in the function.

3) To read a line of text, use the read_line function (below)

int read_line(char *str, int n)

{

int ch, i = 0;

while ((ch = getchar()) != '\n')

{ if (i < n)

{ *str++= ch;

i++;

}

}

*str = '\0'; /* terminates string */

return i; /* number of characters stored */

Thank you very much in advance!

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