Update conversions/octal_to_hexadecimal.py

fix: improvement updates to octal to hexadecimal

Co-authored-by: Tianyi Zheng <tianyizheng02@gmail.com>

conversions/octal_to_hexadecimal.py

@@ -62,11 +62,5 @@ def octal_to_hex(octal: str) -> str:
 
         assert hexadecimal == expected
 
-        print(
-            "Hex of '0o"
-            + num
-            + "' is : "
-            + hexadecimal
-            + " - and Expected was : "
-            + expected
-        )
+        print(f"Hex of '0o{num}' is: {hexadecimal}")
+        print(f"Expected was: {expected}")