Beedle - Oracle free perpetual lending

If a similar external call is performed back-to-back, we can use assembly to reuse any function signatures and function parameters that stay the same. In addition, we can also reuse the same memory space for each function call (scratch space + free memory pointer + zero slot), which can potentially allow us to avoid memory expansion costs.
Note: In order to do this optimization safely we will cache the free memory pointer value and restore it once we are done with our function calls. We will also set the zero slot back to 0 if neccessary.
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