linux2% nasm -f elf -g strrev.asm
linux2% nasm -f elf -g strrepl.asm
linux2% gcc -Wall -g main7.c strrev.o strrepl.o


linux2% ./a.out
str1 = "dlroW olleH"
str2 = "!desrever teg lliw taht gnirts gnol yrev a si sihT"
str3 = "able was I ere I saw elba"

Calling strrev() with NULL did not crash!
str4 = "1"
Calling strrev() with empty string did not crash!

str1 = "ABC ### ### Hello World"
6 chararcters were replaced

str2 = "@@@ @@@ @@@ H@llo Worl@"
11 chararcters were replaced

str3 = "_BC 123 779 H_ll_ W_rld"
4 chararcters were replaced
linux2%