Originally Posted by uma.g
I want to the implementation of the code 'make config' in fedora
That may depend on your definition of the word "implementation":
make is a program. You can get the source code of that program and study it and see the real implementation of that command. But I'm pretty sure you won't understand it.
But make is a program that interpretively executes a "program" (a set of instructions) written in a special purpose language. The implementation you probably want to see is those instructions, not the implementation of make itself.
You'll need to read a lot of documentation about make in order to understand the language those instructions are in. Then (as Ser Olmy
already explained) those instructions are in a file named Makefile and "config" identifies the final such instruction that make is being told to process. A characteristic of this language is that each instruction effectively identifies other instructions that must be executed before
it. So identifying "config" as the last instruction effectively tells make all the instructions it needs to execute.