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string1 file1 string2 file2

where file1 and file2 are file names and string1 and string2 are C strings.

It makes a copy of the content of file1 (input file) in file2 (output file) substituting each sequence of characters equal to string1 with string2.

##Notice that:

• file1 contains an unknown number of rows, but each row is at most of length equal to 100 characters
• string1, string2 and all C strings in file1 have a maximum length equal to 20 characters
• string1 and string2 are proper C strings, i.e., they to not contain spaces, tabs, etc.

##Example Let us suppose to run the program with the following parameters:

test file1.txt check file2.txt

and that file1.txt is the following:

####Regression file.

This file is to test the program.

In the previous line we should have a substitution (testWITHcheck).

Here we should not have it: t-e-s-t.

The following file2.txt has to be generated:

####Regression file.

This file is to check the program.

In the previous line we should have a substitution (checkWITHcheck).

Here we should not have it: t-e-s-t.

Suggestion Use the program to substitute a sub-string within a string

as a subprogram.