Refactored code to improve structure and readability:

[sashatexb]

• Reorganized and consolidated functions in emoji_utils.c.
• Introduced safe_strdup for safer memory handling.
• Used EmojiMapEntry structs for mapping file extensions and device types to emojis.
• Simplified the logic for determining emojis based on file paths and extensions.

[yellow-footed-honeyguide]

Thanks @sashatexb for this contribution! It's a really huge improvement for the project.

I'm accepting all changes except for those in display_utils.c (partially accepted) and emoji_utils.c (partially accepted): I don't know why, but I see additional spaces in the directory listing (see screenshot 1). Maybe it looks different on different computers. My terminal type: foot (on xterm-color256 the problem is the same). My font: JetBrains Mono (with other fonts the problem is the same). Now I've fixed this problem shown in screenshot 1. For me, it works fine now (see screenshot 2).