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     The strcat and strncat functions operate on null-terminated
     strings. The string arguments to these functions are expected to
     contain a null character (\0) marking the end of the string. No
     overflow checking is performed when strings are copied or
     appended.
 
     The strcat function appends <string2> to <string1>, terminates the
     resulting string with a null character, and returns a pointer to
     the concatenated string (<string1>).
 
     The strncat function appends, at most, the first <count>
     characters of <string2> to <string1>, terminates the resulting
     string with a null character (\0), and returns a pointer to the
     concatenated string (<string1>). If <count> is greater than the
     length of <string2>, the length of <string2> is used in place of
     <count>.
 
     The _f... forms of these functions are model-independent (large-
     model) forms that use far pointer forms of the string arguments
     and return values. These model-independent functions can be called
     from any point in the program.
 
     Return Value
 
     The return values for these functions are described above.
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