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Write a function to replace all occurrence of a character with another character and vice versa in a string

 Implement the function to modify and return the string ‘ str’ in such a way that all occurrences of ‘ch1’ in the original string are replaced by ‘ch2’ and all occurrences of ‘ch2’  in the original string are replaced by ‘ch1’.

Assumption: String Contains only lower-case alphabetical letters.

Note: Return null if the string is null or None.

Java 

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 public static String replaceCharacters(String str,char ch1,char ch2){
    if(str==null)
        return null;
    else{
        String result = "";
        for(int i=0; i<str.length; i++){
            char ch = str.charAt(i);
            if(ch==ch1)
                result += ch2;
            else if(ch==ch2)
                result += ch1;
            else
                result += ch;
        }
        return result;
    }
 }

Python

def replaceCharacters(str,ch1,ch2):
    if len(str) is None:
        return None
    else:
        result = ""
        for ch in str:
            if ch==ch1:
                result += ch2
            elif ch==ch2:
                result += ch1
            else:
                result += ch
        return result

 

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