Refactor: rename rmSpace to remove_redundant_spaces (#10796)

### What problem does this PR solve?

- rename rmSpace to remove_redundant_spaces
- move clean_markdown_block to common module
- add unit tests for remove_redundant_spaces and clean_markdown_block

### Type of change

- [x] Refactoring

---------

Signed-off-by: Jin Hai <haijin.chn@gmail.com>

rag/app/resume.py

@@ -25,7 +25,7 @@ from api.db.services.knowledgebase_service import KnowledgebaseService
 from rag.nlp import rag_tokenizer
 from deepdoc.parser.resume import refactor
 from deepdoc.parser.resume import step_one, step_two
-from rag.utils import rmSpace
+from common.string_utils import remove_redundant_spaces
 
 forbidden_select_fields4resume = [
     "name_pinyin_kwd", "edu_first_fea_kwd", "degree_kwd", "sch_rank_kwd", "edu_fea_kwd"
@@ -130,7 +130,7 @@ def chunk(filename, binary=None, callback=None, **kwargs):
         if isinstance(v, list):
             v = v[0]
         if n.find("tks") > 0:
-            v = rmSpace(v)
+            v = remove_redundant_spaces(v)
         titles.append(str(v))
     doc = {
         "docnm_kwd": filename,
@@ -145,7 +145,7 @@ def chunk(filename, binary=None, callback=None, **kwargs):
         if isinstance(v, list):
             v = " ".join(v)
         if n.find("tks") > 0:
-            v = rmSpace(v)
+            v = remove_redundant_spaces(v)
         pairs.append((m, str(v)))
 
     doc["content_with_weight"] = "\n".join(