split token on colon and remove leading plus sign

Reference: aboutcode-org#4229
Signed-off-by: Alok Kumar <alokkumarjipura9973@gmail.com>

Author: alok1304

src/cluecode/copyrights.py

@@ -437,6 +437,23 @@ def get_tokens(numbered_lines, splitter=re.compile(r'[\t =;]+').split):
                 .strip()
             )
 
+            # remove leading plus sign
+            if tok.startswith('+'):
+                tok = tok.lstrip('+')
+                # convert 'AUTHOR' to ('author' or 'Author')
+                if tok == 'AUTHOR':
+                    tok = 'author' 
+
+            # Split tokens like 'Author:Frankie.Chu' into 'Author' and 'Frankie.Chu'
+            if tok.startswith("Author:"):
+                parts = tok.split(":", 1)
+                for part in parts:
+                    part = part.strip()
+                    if part and part not in ':.':
+                        yield Token(value=part, start_line=start_line, pos=pos)
+                        pos += 1
+                continue  
+
             # the tokenizer allows a single colon or dot to be a token and we discard these
             if tok and tok not in ':.':
                 yield Token(value=tok, start_line=start_line, pos=pos)