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void
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multiply_matrices(float a[9], float b[9], float out[9])
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{
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// zero out target matrix
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for (int i = 0; i < 9; i++) {
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out[i] = 0;
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}
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for (int i = 0; i < 3; i++) {
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for (int j = 0; j < 3; j++) {
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for (int k = 0; k < 3; k++) {
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out[i * 3 + j] += a[i * 3 + k] * b[k * 3 + j];
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}
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}
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}
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}
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