Add Title Case Conversion (#10439)

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added more test case and type hint

[pre-commit.ci] auto fixes from pre-commit.com hooks

for more information, see https://pre-commit.ci

updated naming convention

strings/title.py

@@ -0,0 +1,57 @@
+def to_title_case(word: str) -> str:
+    """
+    Converts a string to capitalized case, preserving the input as is
+
+    >>> to_title_case("Aakash")
+    'Aakash'
+
+    >>> to_title_case("aakash")
+    'Aakash'
+
+    >>> to_title_case("AAKASH")
+    'Aakash'
+
+    >>> to_title_case("aAkAsH")
+    'Aakash'
+    """
+
+    """
+    Convert the first character to uppercase if it's lowercase
+    """
+    if "a" <= word[0] <= "z":
+        word = chr(ord(word[0]) - 32) + word[1:]
+
+    """
+    Convert the remaining characters to lowercase if they are uppercase
+    """
+    for i in range(1, len(word)):
+        if "A" <= word[i] <= "Z":
+            word = word[:i] + chr(ord(word[i]) + 32) + word[i + 1 :]
+
+    return word
+
+
+def sentence_to_title_case(input_str: str) -> str:
+    """
+    Converts a string to title case, preserving the input as is
+
+    >>> sentence_to_title_case("Aakash Giri")
+    'Aakash Giri'
+
+    >>> sentence_to_title_case("aakash giri")
+    'Aakash Giri'
+
+    >>> sentence_to_title_case("AAKASH GIRI")
+    'Aakash Giri'
+
+    >>> sentence_to_title_case("aAkAsH gIrI")
+    'Aakash Giri'
+    """
+
+    return " ".join(to_title_case(word) for word in input_str.split())
+
+
+if __name__ == "__main__":
+    from doctest import testmod
+
+    testmod()