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Vyxal, 77 bitsv1, 9.625 bytes
ḣ≬‡⁰≠Ǒ⟇↔Ṡ+
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Explained
The very first explanation generated using Luminespire, a currently work-in-progress explanation formatting assistant.
ḣ≬‡⁰≠Ǒ⟇↔Ṡ+
ḣ # Push first character of input, then all of input minus first character
≬ ↔ # R...