feat(solutions): slugify/python/function (#16)

Author: Mehln

challenges/slugify/solutions/python/function/README.md

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+# slugify/python/function
+
+Created by [@Mehln](https://github.com/Mehln) on 14 October 2022.

challenges/slugify/solutions/python/function/solution.py

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+string = input()
+
+def isalphanum(character: str)->bool:
+    is_lowercase_letter = ord(character) >= ord('a') and ord(character) <= ord('z')
+    is_upper_letter = ord(character) >= ord('A') and ord(character) <= ord('Z')
+    is_digit = ord(character) >= ord('0') and ord(character) <= ord('9')
+    return is_upper_letter or is_lowercase_letter or is_digit
+
+string = string.strip(' ')
+string = string.strip('-')
+answer = ""
+current = ""
+
+for character in string:
+    if character == ' ' or (character == '-' and len(current)>0):
+        answer += current
+        answer += '-'
+        current = ""
+    elif isalphanum(character):
+        current += character
+
+answer += current
+
+print(answer)