EXTRA CREDIT: (20 points) Create a program proj5_3.cpp that would read the content of an input file and write it back to an output file with all the letters "C" changed into "C++". The names of input/output files are entirely up to you. For example the following file content: 'C is one of the world's most modern programming languages. There is no language as versatile as C, and C is fun to use." should be changed and saved to another file with the following content: "C++ is one of the world's most modern programming languages. There is no language as versatile as C++, and C++ is fun to use." To read one character from the file you should use the get() function: ifstream inputFile; char next; ... inputFile.get(next); Absolutely NO GLOBAL VARIABLES/ARRAYS/OBJECTS ALLOWED for ALL PROBLEMS