:convertHastag Provide a function to convert a string to a hashtag, removing spaces and adding a '#' at the beginning. The function should also remove any existing hashtags in the string before conversion. Demonstrate the function using the string "This is a test #testString" and output the result in the format:'https://www.twitter.com/hashtag/[HASHTAGᥚ


https://www.twitter.com/hashtag/#ThisIsATest
user
https://www.twitter.com/hashtag/#ThisIsATest
assistant