Change the loop structure

[ohno]

For performance, we should replace

TwoBody.jl/src/Rayleigh-Ritz.jl

Lines 369 to 373 in 7838967

	for j in 1:nₘₐₓ
	for i in 1:j
	H[i,j] = element(hamiltonian, basisset.basis[i], basisset.basis[j])
	end
	end

with

H = ...
for o in hamiltonian
 for j in 1:nₘₐₓ 
   for i in 1:j 
     H[i,j] += element(o, basisset.basis[i], basisset.basis[j]) 
   end 
 end 
end

Please include an acknowledgments section to express your gratitude for the feedback received from participants of JuliaHEP Workshop 2025 at Princeton.