Cross-line string literals cause parsing errors in shader initalization function

[byteFishr]

Description:
when parsing the demo function, cross-line string literals like the following cause parsing errors, resulting in error nodes in the AST or parsing output:

const char* s = 
"int a;\
int b;\
void main(){\
c = a;\
d = b;\
}";

the issue occurs because the string spans multiple lines and is split by backslash() continuation characters. while this is valid C syntax, the parser appears to not correctly handle such multi-line string literals,leading to incorrect parsing results.

• Environment:
  Parser version: v0.0.0-20240827094217-dd81d9e9be82
• Language: C
• Example code snippet_provided_above