Write a subroutine that takes the segment and offset pairs for two null terminated strings. If the first string is present anywhere inside the second string, the subroutine returns 1 in AX and otherwise it returns 0.
For example, if the first string is "cde" and the second is "abcdef", the subroutine returns 1. If however the second string is "abcd", the subroutine returns 0. Be careful about the lengths of strings and never access beyond the null byte at the end of string. Do check your subroutine with "aab" as the first string and "aaab" as the second. Since "aab" is a substring of "aaab", your subroutine should return 1.

Intel 86 processor