Fixed bugs (TheAlgorithms#2474)

* fixed bug

* fixup! Format Python code with psf/black push

Co-authored-by: github-actions <${GITHUB_ACTOR}@users.noreply.github.com>

Author: realDuYuanChao

strings/check_anagrams.py

@@ -1,18 +1,31 @@
-def check_anagrams(a: str, b: str) -> bool:
+"""
+wiki: https://en.wikipedia.org/wiki/Anagram
+"""
+
+
+def check_anagrams(first_str: str, second_str: str) -> bool:
     """
     Two strings are anagrams if they are made of the same letters
     arranged differently (ignoring the case).
     >>> check_anagrams('Silent', 'Listen')
     True
     >>> check_anagrams('This is a string', 'Is this a string')
     True
+    >>> check_anagrams('This is    a      string', 'Is     this a string')
+    True
     >>> check_anagrams('There', 'Their')
     False
     """
-    return sorted(a.lower()) == sorted(b.lower())
+    return (
+        "".join(sorted(first_str.lower())).strip()
+        == "".join(sorted(second_str.lower())).strip()
+    )
 
 
 if __name__ == "__main__":
+    from doctest import testmod
+
+    testmod()
     input_A = input("Enter the first string ").strip()
     input_B = input("Enter the second string ").strip()