Please complete src/main/java/com/bytelegend/Challenge.java's countUpperCaseLetters() method. countUpperCaseLetters() method returns the number of upper case letters ...

Aim is to replace all the lower-case characters in the string to upper-case and upper-case characters to lower-case. - AquisBlue/-Java-Program-to-replace-lower-case-characters-with-upper-case-and-vice ...