String Function with Switch Case?

Question

Supposed Output:

Choose the String Function to demo: 1
Enter first string: Miko
Enter second string: Santos
Before function call:
str1 = Miko
str1 = Santos
After concatenation/appending:
str1 = MikoSantos
str2 = Santos
*********************************************
1 - strcat()
2 - strncat()
3 - strcpy ()
4 - strncpy ()
5 - strlen ()
6 - strcmp ()
7 - strcmpi ()
8 - strchr ()
9 - strrchr ()
10 - strstr ()
11 - strdup ()
12 - strlwr ()
13 - strupr ()
14 - strrev ()
15 - strset ()
16 - strnset ()
17 - strtok ()
18 = Exit
Choose the String Function to demo:

Answer 1

Each those functions has different signature, and requires different argument(s). Not to mention some of them are non standard, which means they may not be available in standard compliant compilers.

How do you deal with that?

Answer 2

I’m not really sure yet, but I know its a string function

Answer 3

https://code.sololearn.com/cLlmpbjn4kf9