Crush test: avoid crush on NULL param with a size of 0

[mfunyu]

For the two functions that are listed below, there is an edge case that many students tend to miss. Add test cases to cover these cases.

strlcat

• strlcat(NULL, "abc", 0); <- does not crush
• strlcat(NULL, "abc", 1); <- crush
• strlcat("abc", NULL, 0); <- crush

  strnstr

• strnstr(NULL, "abc", 0); <- does not crush
• strnstr(NULL, "abc", 1); <- crush
• strnstr("abc", NULL, 0); <- crush

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