SUBJECT: Inquiry regarding inconsistent sizing in `editorSyntax` struct

Hello, I am relatively new to C programming so forgive me if I am mistaken. However, I noticed while looking at the struct, that there was a sizing inconsistency. Here is the definition of the struct:

struct editorSyntax {
    char **filematch;
    char **keywords;
    char singleline_comment_start[2];
    char multiline_comment_start[3];
    char multiline_comment_end[3];
    int flags;
};

I noticed that singleline_comment_start is initialised with 2 characters for '//' defined later on, which cuts the null terminator off, and not making it a C string. However, in the multiline comment ending and starting, it leaves space for the null terminator as it is 3 bytes, and the start and ending of the multiline comment is 2 bytes. So 2 bytes for the comment sign and 1 byte for the null terminator.

Was dropping the null terminator singleline_comment_start a trick to save memory (which is what I thought it was)? If so, why is the multiline comment also not stored like that? Your help woudl be appreciated.