Fix the characteristic that the trim() and trim_end() functions do not remove the \0 character.

[xb284524239]

fix #618

Hello @Enet4 ,

I have standardized the codebase by uniformly substituting the trim() and trim_end() functions with the trim_end_matches([' ', '\u{0}']) function, which was replicated from the to_str() function within the primitive.rs file.

I am rather uncertain as to the rationale behind the concurrent existence of the trim() and trim_end() and trim_end_matches([' ', '\u{0}']) functions in the previous implementation. Was this a deliberate design choice?

Moreover, I am pondering whether it might be more apt to utilize the trim_matches(|c: char| c == '\0' || c.is_whitespace()) function instead. However, I remain indecisive on this matter.

[Enet4]

I have standardized the codebase by uniformly substituting the trim() and trim_end() functions with the trim_end_matches([' ', '\u{0}']) function, which was replicated from the to_str() function within the primitive.rs file.

I am rather uncertain as to the rationale behind the concurrent existence of the trim() and trim_end() and trim_end_matches([' ', '\u{0}']) functions in the previous implementation. Was this a deliberate design choice?

I believe that the occurrences of both trim* and trim_end* are indeed deliberate. This is because some values admit both leading and trailing whitespace. https://dicom.nema.org/medical/dicom/2024d/output/chtml/part05/sect_6.2.html In the cases where trim() was called, please retain the begin trimming.

Moreover, I am pondering whether it might be more apt to utilize the trim_matches(|c: char| c == '\0' || c.is_whitespace()) function instead. However, I remain indecisive on this matter.

I would stick to checking specifically for spaces, as that is what's listed by the standard. is_whitespace may cover more cases of whitespace than necessary and/or intended.

[xb284524239]

Hello @Enet4 ,
The changes to the calls of trim() and trim_end() have been restored, and only the matching for the \0 character has been added.