Assumption: String Contains only lower-case alphabetical letters. Note: Return null if string is null. If both characters are not present in string or both of them are same , then return the string ...

Strings can be considered index-based collections of smaller strings or characters, each one referenced by its position in the string.

In Python, Unicode strings are the go-to solution for handling non-ASCII characters. Unicode provides a unique number for every character, no matter the platform, program, or language, which is ...