Fix reference to index() (overrides reference in strings.h)
Fix reference to index() (overrides reference in strings.h)

eddieantonio/isri-ocr-evaluation-tools,eddieantonio/ocreval,eddieantonio/ocreval,eddieantonio/isri-ocr-evaluation-tools,eddieantonio/isri-ocr-evaluation-tools,eddieantonio/ocreval