Fix typo across multiple files

[Pronoss]

• README.md - Fixed "Zero-knowldge" to "Zero-knowledge."
• accumulation_vector.hpp - Corrected "accumlate" to "accumulate."
• sparse_vector.tcc - Fixed "unitialized" to "uninitialized."
• alu_arithmetic.tcc - Fixed typos in comments, such as "shfited_result" to "shifted_result."
• variable.cpp - Corrected "occurred" spelling in assertions.
• kc_multiexp.hpp - Fixed "dependend" to "depended" and similar corrections for readability.

[Pronoss]

Hi @scipr-lab maintainers 👋 – just a quick reminder about PR #213 (“Fix typo across multiple files”). This PR updates several typos:

• README.md: “Zero-knowldge” → “Zero-knowledge”
• accumulation_vector.hpp: “accumlate” → “accumulate”
• sparse_vector.tcc: “unitialized” → “uninitialized”
• alu_arithmetic.tcc: “shfited_result” → “shifted_result” (in comments)
• variable.cpp: “occured” → “occurred” (in assertions)
• kc_multiexp.hpp: “dependend” → “depended” (and similar fixes)

Thanks for taking a look when you have a moment! 😊