1. A method performed by a device having an operating system and a system library for enhancing operable functionality of a software program, comprising: receiving, by the device, a plurality of input source code files from the software program submitted by a developer; identifying, by the device, one or more candidate code snippets from the plurality of input source code files by comparing source code feature vectors for the plurality of input source code files to library function feature vectors for library functions stored in the system library to identify at least a first candidate code snippet which meets at least a first similarity threshold measure for a first library function stored in the system library, and removing one or more code snippets that do not meet a similarity threshold measure for library functions stored in the system library; identifying, by the device, 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 comprising implementing an input/output matching algorithm for selecting a candidate code snippet which generates the same output as the first library function when both are injected with a shared input; and presenting, to the developer, a library function recommendation comprising the first validated code snippet, the first library function, and instructions for replacing the first validated code snippet with the first library function.