Style: Adjust whitespace and formatting for function definitions

[jmartfrut]

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Benchmark Results (Julia v1)

Time benchmarks

	main	2cc20da...	main / 2cc20da...
Constitutive models/Visco-elastic Ψ	0.0501 ± 0.026 ms	0.0501 ± 0.026 ms	1 ± 0.73
Constitutive models/Visco-elastic ∂Ψu	0.0662 ± 0.011 ms	0.0658 ± 0.0027 ms	1.01 ± 0.18
Constitutive models/Visco-elastic ∂Ψuu	0.116 ± 0.016 ms	0.116 ± 0.016 ms	0.997 ± 0.19
Simulations/StaticMechanicalDirichlet	0.142 ± 0.008 s	0.142 ± 0.0083 s	1 ± 0.081
Simulations/StaticMechanicalNeumann	0.129 ± 0.013 s	0.13 ± 0.011 s	0.997 ± 0.13
Simulations/ViscoElastic	8.48 s	8.35 s	1.02
Tensor algebra/Cofactor	0.07 ± 0.01 μs	0.07 ± 0.009 μs	1 ± 0.19
Tensor algebra/Det(A)Inv(A')	0.131 ± 0.01 μs	0.15 ± 0.011 μs	0.873 ± 0.092
Tensor algebra/δδ_λ_2d	30 ± 0 ns	30 ± 0 ns	1 ± 0
Tensor algebra/δδ_μ_2d	30 ± 0 ns	30 ± 0 ns	1 ± 0
time_to_load	2.68 ± 0.014 s	2.69 ± 0.044 s	0.996 ± 0.017

Memory benchmarks

	main	2cc20da...	main / 2cc20da...
Constitutive models/Visco-elastic Ψ	1.25 k allocs: 0.0789 MB	1.25 k allocs: 0.0789 MB	1
Constitutive models/Visco-elastic ∂Ψu	1.37 k allocs: 0.0911 MB	1.37 k allocs: 0.0911 MB	1
Constitutive models/Visco-elastic ∂Ψuu	2.33 k allocs: 0.158 MB	2.33 k allocs: 0.158 MB	1
Simulations/StaticMechanicalDirichlet	1.61 M allocs: 0.115 GB	1.61 M allocs: 0.115 GB	1
Simulations/StaticMechanicalNeumann	1.48 M allocs: 0.0933 GB	1.48 M allocs: 0.0933 GB	1
Simulations/ViscoElastic	0.129 G allocs: 8.3 GB	0.129 G allocs: 8.3 GB	1
Tensor algebra/Cofactor	1 allocs: 0.0781 kB	1 allocs: 0.0781 kB	1
Tensor algebra/Det(A)Inv(A')	4 allocs: 0.25 kB	4 allocs: 0.25 kB	1
Tensor algebra/δδ_λ_2d	0 allocs: 0 B	0 allocs: 0 B
Tensor algebra/δδ_μ_2d	0 allocs: 0 B	0 allocs: 0 B
time_to_load	0.149 k allocs: 11.1 kB	0.149 k allocs: 11.1 kB	1