Best practices in Magento for modifying private function code in vendor

#!/bin/bash

PATCH_FILES=( $(find ./m2-patch -name "*.patch") )
for file in "${PATCH_FILES[@]}"; do
    echo "$file"
done

for PATCH_FILE in "${PATCH_FILES[@]}"
do
    APPLIED=$(patch -p1 --dry-run < $PATCH_FILE | grep -c "ignored")

    if [ $APPLIED -eq 0 ]; then
        patch -p1 < $PATCH_FILE
        echo "Apply success: $PATCH_FILE"
    else
        echo "Patch has been applied: $PATCH_FILE"
    fi
done

#Here is the patch content

bash  m2-patch/apply-patch.sh