Problem $1$: Pointer$-$based Functions $(25$ points$)$

Write a program in which you create four functions that work with C$-$style strings. These functions must use pointers in their implementation and must not use any C$++$ library code.

The functions to implement are:

$1.$ length$-$which determines how many characters are in the string; its parameter is a pointer to the C $-$style string; its output value is a number representing the count of characters in the string which might be zero$-$note that the input string is not modified

$2.$ indexof $-$ which determines the index location of a character; its parameters are a pointer to the C$-$style string and a character which is to be searched for; its output value is a number representing the first $($lowest$)$ index of the character or $-1$ if the character is not found in the string$-$note that the input string is not modified

$3.$ replace $-$ which changes every occurrences of a character within the string with a different character; its parameters are a pointer to the C$-$style string, a character representing the character to replace, and another character representing the character that each found occurrence is changed to; the output value is a pointer to the input string $($which permits easier coding for the client code$)-$note that the input string is modified $4.$ concat $-$ which produces a new C$-$style string being the concatenation of two input strings; its parameters are two pointers to strings; the output value is a pointer to a newly created string which is a copy of the first string followed by a copy of the second$-$note that the input strings are not modified and that the client code should delete the new string before exiting the program

Write a program that tests each function and displays the results of their use.

Design, edit, run, test, and debug your program. Enter the completed C$++$ code here:

C$++$ code for the lab project:

Run the code, take a screenshot of the results, and insert the screenshot here:

Screenshot of the results:

Problem $2$: Reading and Writing Text Files $(25$ points$)$

Write a program in which you read an existing text file which contains multiple lines, some of which are blank. Open an output file and write to it the non$-$blank lines.

Display the input and output files after the program runs to demonstrate proper results.

Design, edit, run, test, and debug your program. Enter the completed C$++$ code here:

C$++$ code for the lab project: