Make a local function static

Also remove some meaningless comments

src/data/SpikeGen.cpp

@@ -15,7 +15,7 @@
 #include "aidge/data/Spikegen.hpp"
 
 namespace Aidge {
-Tensor rateConvert(const Tensor& tensor) {
+static Tensor rateConvert(const Tensor& tensor) {
 
     auto result = tensor.clone();
 

src/data/Tensor.cpp

@@ -805,21 +805,19 @@ const Tensor& Tensor::ref(std::shared_ptr<Tensor>& fallback,
 Tensor Tensor::repeat(int times) const {
     AIDGE_ASSERT(times > 0, "repeat count must be positive");
 
-    // Ensure that the source tensor is contiguous.
     Tensor src = *this;
     if (not src.isContiguous()) {
         src = src.clone();
         src.makeContiguous();
     }
 
-    // Build new dimensions: new_dims = {times} followed by current dims.
+    // Build new dimensions: new_dims = {times} followed by current dims
     std::vector<DimSize_t> newDims;
     newDims.push_back(static_cast<DimSize_t>(times));
     for (const auto &d : dims()) {
         newDims.push_back(d);
     }
 
-    // Create an output tensor with the new dimensions.
     Tensor out(newDims);
     out.setDataType(dataType(), false);
     out.setDataFormat(dataFormat());
@@ -829,7 +827,6 @@ Tensor Tensor::repeat(int times) const {
 
     // Each "block" is a copy of the data from the original tensor.
     const std::size_t block = src.size();
-    // Loop over the repeat count and copy the block each time.
     for (int i = 0; i < times; ++i) {
         // out.getImpl()->copy(source pointer, number of elements, destination offset)
         out.getImpl()->copy(src.getImpl()->rawPtr(src.getImplOffset()),