Number of times characters of a string is present in another string

This problem is one of the classic competitive questions dealing with strings, I guess we can understand the logic by the question itself, so we will be given with two strings, the main string and the sample string. Now we need to compare and check how many times a charachter in the main string appers int the other i.e the count and finally in the end we need to return the total number. Now let's work on the implementation part but before we proceed please note that each and every character of ...