fix(fft): make bit_reverse_permute static, remove from public API and testsHEADmain

2 files changed, 1 insertions, 4 deletions

diff --git a/src/audio/fft.cc b/src/audio/fft.cc
index 6512fdc..7523b42 100644
--- a/src/audio/fft.cc
+++ b/src/audio/fft.cc
@@ -9,7 +9,7 @@
 
 // Bit-reversal permutation (in-place)
 // Reorders array elements by reversing their binary indices
-void bit_reverse_permute(float* real, float* imag, size_t N) {
+static void bit_reverse_permute(float* real, float* imag, size_t N) {
   size_t temp_bits = N;
   size_t num_bits = 0;
   while (temp_bits > 1) {
diff --git a/src/audio/fft.h b/src/audio/fft.h
index 6a54742..df37ad5 100644
--- a/src/audio/fft.h
+++ b/src/audio/fft.h
@@ -8,9 +8,6 @@
 
 #include <cstddef>
 
-// Bit-reversal permutation (in-place). Exposed for testing.
-void bit_reverse_permute(float* real, float* imag, size_t N);
-
 // Forward FFT: Time domain → Frequency domain
 // Input: real[] (length N), imag[] (length N, can be zeros)
 // Output: real[] and imag[] contain complex frequency bins