$(50$ points$)$ Complete a function "concatFiles$($const char$*$ name$1,$ const char$*$ name$2,$ const char$*$ name$3)"$ in the attached program template "prog.c$"$ After its completion, name$3$ file will have contents obtained by concatenating the contents of namel file and name$2$ file. For example, if namel file contains the following $9$ characters:

ABCDMHJWP

And, if name$2$ file contains the following $6$ characters: TUVXYZ

Then, after its execution the name$2$ file will contain $15$ characters:

ABCDMHJWPTUVXYZ

You can only make use of the following system calls in the function implementation:

a$.$ open$()$

b$.$ read$()$

c$.$ Iseek$()$

d$.$ write$()$

e$.$close$()$

You have to complete the function definition in the attached "prog.c$"$ file which includes main$()$ calling dupFile$("$datal$.$txt$",$ "data$2.$txt$").$ "datal.txt$"$ file is also attached. Your function should use the buffer size of $10$ bytes in reading and writing. Please take the following requirements into account when you create the function definition:

namer file and name$2$ f$$le should be existent when the function is called. Otherwise, your program should exit without doing anything.

Name$3$ file should not be existent when you call the function. It needs to be created as an empty file and the contents need to be filled up$.$ If name$3$ file already exists, your program should exit without doing anything.