C / C++ / MFC

for (int i = 0; i < strlen(string); i++)
{
    strcpy(zev, string);

    for (char c = 'a'; c <= 'z'; c++)
    {
        zev[i] = c;
        printf("%s\n", zev);
    }
}

char PathName[_MAX_PATH]; // _MAX_PATH is defined in stdlib.h
for (i = 0; <= 20; i++)
{
    strcpy(PathName, "C:\\input\\");
    strcat(PathName, myFiles[i]);
    myFunc(PathName);
}

system("copy input/*.txt  "); // This line copies all the text files to pwd

/* After manipulations with all the required files.... */

system("del *.txt");

char filenames[4][50] = { "001.txt", "002.txt", "003.txt", "004.txt" };
char inputFolder[] = "inputFolder";
int i, maxFiles=4;`

for (i=0; i<maxFiles; i++)
{
    strcpy(fullPath, inputFolder);  // fullPath = "inputFolder"
    strcat(fullPath, "\\");         // fullPath = "inputFolder\"
    strcat(fullPath, myFiles[i]);   // fullPath = "inputFolder\001.txt"  - first iteration only
    myFunc(fullPath);               // myFunc("inputFolder\001.txt");
}

#!/usr/bin/perl
# Usage: perl invalidate-signing-certs.pl <in.pdf> out.pdf
#
binmode(STDIN);
binmode(STDOUT);
$/ = "\0";
while(<>) {
s#(/Perms<</DocMDP.*?>>)#' ' x length $1#ge;
s#(/Ff 1)(?=.*?/Lock )#' ' x length $1#ge;
s#(?<=/Lock)(.*?)(/Ff 1)#"$1" . ' ' x length $2#ge;
s#(/Lock .*?)(?=/)#' ' x length $1#ge;
print $_;
}