Line breaks should be ignored for three letter sequence codes

[AlexeyGirin]

Steps to Reproduce

1. Go to Macro - Flex mode
2. Load using Paste from clipboard way:

AlaAl
aCysCys

Actual behavior
System throws an error: Unsupported symbols: Convert error! Given string could not be loaded as (query or plain) molecule or reaction, see the error messages

Expected behavior
Content should be loaded correct (line breaks should be ignored):

As per requirement:

1.6. Within one sequence every n*3+1 letter symbol has to be uppercase.

AlaAlaCysCys is valid
AlaAl
aCysCys is valid (ignoring line breaks - requirement 1.4)
AlaAla CysCys is valid (two sequences - requirement 1.5)
AlAalaCysCys is not valid (third letter is uppercase and the fourth one is not)

Versions

• Ketcher Version 2.27.0-rc.1 Build at 2024-11-05; 14:55:18
• Indigo Toolkit Version 1.26.0-rc.1.0-g904d2d992-wasm32-wasm-clang-19.0.0
• Chrome Version 130.0.6723.117 (Official Build) (64-bit)
• Win10

Found while testing - epam/ketcher#5556, #2472

[AlexeyGirin]

Verified.

• Ketcher Version 2.27.0-rc.2 Build at 2024-11-12; 19:26:10
• Indigo Toolkit Version 1.26.0-rc.2.0-gfec30ecd8-wasm32-wasm-clang-19.0.0
• Chrome Version 131.0.6778.70 (Official Build) (64-bit)
• Win10