Dev

[mr-tron]

Improve performance.

Current speed:

cpu: Apple M4
BenchmarkGenerateVDFByTarget
BenchmarkGenerateVDFByTarget/target_500
BenchmarkGenerateVDFByTarget/target_500-10         	       3	 454050319 ns/op	1166237434 B/op	11017709 allocs/op
BenchmarkGenerateVDFByTarget/target_1000
BenchmarkGenerateVDFByTarget/target_1000-10        	       2	 773355584 ns/op	2314514484 B/op	21894998 allocs/op
BenchmarkGenerateVDFByTarget/target_10000
BenchmarkGenerateVDFByTarget/target_10000-10       	       1	7302176333 ns/op	22163331696 B/op	210768079 allocs/op
BenchmarkVerifyVDFByTarget
BenchmarkVerifyVDFByTarget/target_500
BenchmarkVerifyVDFByTarget/target_500-10           	       4	 273855135 ns/op	394709076 B/op	 3589633 allocs/op
BenchmarkVerifyVDFByTarget/target_1000
BenchmarkVerifyVDFByTarget/target_1000-10          	       5	 243496925 ns/op	375638987 B/op	 3431327 allocs/op
BenchmarkVerifyVDFByTarget/target_10000
BenchmarkVerifyVDFByTarget/target_10000-10         	       5	 244052708 ns/op	390264870 B/op	 3552606 allocs/op

After improvment:

cpu: Apple M4
BenchmarkGenerateVDFByTarget
BenchmarkGenerateVDFByTarget/target_500
BenchmarkGenerateVDFByTarget/target_500-10         	       5	 217132292 ns/op	276672008 B/op	 1581233 allocs/op
BenchmarkGenerateVDFByTarget/target_1000
BenchmarkGenerateVDFByTarget/target_1000-10        	       4	 295034708 ns/op	542194624 B/op	 3109582 allocs/op
BenchmarkGenerateVDFByTarget/target_10000
BenchmarkGenerateVDFByTarget/target_10000-10       	       1	1760387958 ns/op	5016660616 B/op	28852262 allocs/op
BenchmarkVerifyVDFByTarget
BenchmarkVerifyVDFByTarget/target_500
BenchmarkVerifyVDFByTarget/target_500-10           	       7	 165926232 ns/op	91265298 B/op	  514340 allocs/op
BenchmarkVerifyVDFByTarget/target_1000
BenchmarkVerifyVDFByTarget/target_1000-10          	       7	 163517387 ns/op	84978422 B/op	  478850 allocs/op
BenchmarkVerifyVDFByTarget/target_10000
BenchmarkVerifyVDFByTarget/target_10000-10         	       7	 164501018 ns/op	82835457 B/op	  466762 allocs/op
PASS