app.py

import gradio as gr
def hide_message(reg,sec):
    out = reg + ''.join(chr(0xE0000 + ord(ch)) for ch in sec)
    return out
def decode_message(inp):
    return ''.join(chr(ord(ch) - 0xE0000) if 0xE0000 <= ord(ch) <= 0x10FFFF else chr(ord(ch)) for ch in inp)

with gr.Blocks() as app:
    with gr.Tab("Hide"):
        with gr.Row():
            with gr.Column():
                reg = gr.Textbox(label="Visible String")
                sec = gr.Textbox(label="Secret Message")
            btn=gr.Button("Hide")
        outp=gr.Textbox(label="Output Message")
    with gr.Tab("Decode"):
        with gr.Row():
            inp_mes=gr.Textbox(label="Hidden Message",lines=4)
            dec_btn=gr.Button("Decode")
        out_d=gr.Textbox(label="Decoded Message")
    dec_btn.click(decode_message,inp_mes,out_d)
    btn.click(hide_message,[reg,sec],outp)
app.launch()