This challenge is a slightly enhanced version of the 'remove leading zeros' problem. The 'remove leading zeros' problem involves removing all the occurrences of the leading zeroes from a number. What makes this challenge different is the requirement to remove the 'leading' occurrences of the first character in the string. So in this challenge, it is not zeroes that you are looking for, instead the first character in the string should be searched and all the leading occurrences should be removed.
This problem is related to a reservation system where customers book a service and pay it in one or more transactions which may happen on different dates.