A method and apparatus are disclosed for enhancing operable functionality of input source code files from a software program by preprocessing input source code files with codeword processing operations to generate a plurality of preprocessed input source code files, identifying candidate code snippets by pruning one or more preprocessed input source code files that do not meet a similarity threshold measure for library functions stored in the system library, and identifying at least a first validated code snippet from the one or more candidate code snippets that matches a first library function stored in the system memory on the basis of at least first and second matching metrics.