So, right now in my computer science class(a beginners class), we are focusing on an assignment called Letter Replacement. Basically, the purpose of the assignment is to enable us to build a better understanding on how to use a string builder class. However, the assignment requires that we have our program read in a word and then replace every other letter with an asterisk(Ex:*). My question is how can you replace letters in a string, specifically with an asterisk? I would appreciate a good explanation as I am very much a beginner and struggle with Computer Science. Thank you!

The computer language is in C++

An example of Input and Output is:

Enter a word: Sing

Output:

Alternate word: S*n*g