Помогите с Ассемблером

 section .data 
    str1 db "Hello", 0 
    str2 db "World", 0 
    fmt db "Common byte: %c", 10, 0 
 
section .text 
    global main 
    extern printf 
 
main: 
    mov esi, str1 
    mov edi, str2 
     
find_common: 
    mov al, [esi] 
    mov bl, [edi] 
    and al, bl 
    jz no_common 
     
    push eax 
    push fmt 
    call printf 
    add esp, 8 
     
    jmp end 
 
no_common: 
    mov eax, 0 
     
end: 
    ret 

 section .data 
    string db "Hello World", 0 
    replacement db '*' 
    fmt db "Result: %s", 10, 0 
 
section .text 
    global main 
    extern printf, strlen 
 
main: 
    push string 
    call strlen 
    add esp, 4 
     
    mov ecx, eax 
    shr ecx, 1  ; divide length by 2 
    mov esi, string 
    add esi, ecx  ; move to middle of string 
     
replace_loop: 
    mov byte [esi], '*' 
    inc esi 
    loop replace_loop 
     
    push string 
    push fmt 
    call printf 
    add esp, 8 
     
    ret 

 section .data 
    string db "ABRACADABRA", 0 
    replacement db '*' 
    fmt db "Result: %s", 10, 0 
 
section .text 
    global main 
    extern printf 
 
main: 
    mov esi, string 
     
replace_loop: 
    mov al, [esi] 
    test al, al 
    jz end_loop 
     
    cmp al, 'A' 
    jne next_char 
     
    mov byte [esi], '*' 
     
next_char: 
    inc esi 
    jmp replace_loop 
     
end_loop: 
    push string 
    push fmt 
    call printf 
    add esp, 8 
     
    ret 

 section .data 
    string db "Hello World", 0 
    replacement db '*' 
    fmt db "Result: %s", 10, 0 
 
section .text 
    global main 
    extern printf, strlen 
 
main: 
    push string 
    call strlen 
    add esp, 4 
     
    mov ecx, eax 
    shr ecx, 1  ; divide length by 2 
    mov esi, string 
     
replace_loop: 
    mov byte [esi], '*' 
    inc esi 
    loop replace_loop 
     
    push string 
    push fmt 
    call printf 
    add esp, 8 
     
    ret 

 section .data 
    original db "Hello World", 0 
    modified db "Hello World", 0 
    replacement db '*' 
    fmt1 db "Original: %s", 10, 0 
    fmt2 db "Modified: %s", 10, 0 
 
section .text 
    global main 
    extern printf, strlen 
 
main: 
    push original 
    push fmt1 
    call printf 
    add esp, 8 
     
    push original 
    call strlen 
    add esp, 4 
     
    mov ecx, eax 
    mov esi, modified 
     
replace_loop: 
    mov byte [esi], '*' 
    inc esi 
    loop replace_loop 
     
    push modified 
    push fmt2 
    call printf 
    add esp, 8 
     
    ret