Bug in atkinsSieve and eratosthenesSieve functions

[Shivaji-Shill]

The functions atkinsSieve and eratosthenesSieve have some bugs:

1. In atkinsSieve:

   • The loop for(i = 7; i < limit; i++) does not include the limit itself, so primes equal to the limit are missed.

2. In eratosthenesSieve:

   • The sieve initialization and result extraction are incorrect, leading to wrong prime numbers.
   • Looping logic skips numbers incorrectly.

Suggested fix: Adjust loop limits and simplify sieve logic.