esolang test

hello.txt

This language process each line as an unit.
╔══╗ ╔══╗ This line will push 2 and 2 to the stack.
╚══╝ ╚══╝           
╔══╗ ╔══╗ This line will push again.    
║«0--0» ║ This will take 4 elements out of the stack, multiply them and put them back.    
╚══╝ ╚══╝      
╔══╗ ╔══╗ This will push 2 and 2...   
╚══╝ ╚══╝     
     «00» This will take two elements out of the stack, and multiply them.
«()» ╔══╗ This line will take two elements out of the stack, multiply them, push the result and then push 2 to the stack
╔══╗ ╔══╗ 
╔══╗ ╔══╗ Nothing new here...
╚══╝ ╚══╝ 
╚══╝ ╚══╝ 
╚══╝ 
«-0|0-» Nothing new here...
┌**┐....This line will take two elements out of the stack, SUM them and push the result.

╔════════╗
║.V.┌**┐.║  Nothing new here...
║.-►╔═══╗║  This line will copy the top of the stack and push it, and then it'll push 3
║ ▼►.....║  This line will pop two times, subtract the first from the second, put it back, and then copy it
║........║ 
║╔══════╗║  Nothing new here...
║║..╔═╗ ║║  Nothing new here...
║║..╚═╝ ║║
║║┌(*)┐►►║  Here we'll pop 3 elements, multiply them, push the result and then copy it 2 times.
╔═══╗
┌**┐

so far we have 'hello'

╔══╗►►►
►«-(*)-»►

now let's build 'world'
╔══╗►► ►►►«-(())-»┌**┐

╔═══════════════════════╗
║         ┌**┐ .        ║
║         ► .           ║
║    ╔════════╗         ║
║    ▼►                 ║
║   ╔═══╗┌**┐ .         ║
║   ► .                 ║
║   ╔══════╗▼           ║
║   ► .                 ║
║   ╔════════╗▼         ║
║     ╔══╗►►►║          ║
║   ►«-(*)-» ║ .        ║
║   ╔═╗      ║          ║
║   ┌**┐     ║ .        ║
║ .                     ║
╚═══════════════════════╝
printing starts here.
this star  ╔════════════╗
is the pr- ☼            ║ 
int opcode ╚════════════╝
it takes the first element as the number of chars to print. then it pops that
number of elements from the stack and prints them as a string.